Disney+ confirms that it is adding an IMAX Enhanced viewing option for 13 Marvel movies including Shang-Chi on November 12. DTS audio is also coming to Disney+.
Update 11.11.2021 The IMAX Enhanced versions are now available on Disney+, at least in some regions. They play in Dolby Vision.
Update 9.11.2021: Updated with official information from Disney, IMAX, and Xperi (DTS) as well as Disney's FAQ for IMAX Enhanced.
IMAX Enhanced aspect ratio
Starting November 12 (Disney+ Day), subscribers will get the option to watch 13 Marvel movies (full list in the table) in an expanded IMAX aspect ratio (1.90:1) for a picture that is up to 26% taller compared to regular widescreen.

- "Disney, Marvel Studios, and IMAX have collaborated for years to bring the world’s most popular films to the big screen, and on Friday we’ll start to bring IMAX technology to subscribers with IMAX Enhanced viewing in the Disney+ app," said Michael Paull, President of Disney+ and ESPN+. "We’re thrilled to create new value for Marvel fans and audiences on Disney+, and we’re looking forward to offering even more IMAX Enhanced functionality in the future."



Avengers: Endgame and Avengers: Infinity War were shot from start to end with IMAX cameras but the other Marvel movies only have sequences shot in the IMAX format. Non-IMAX scenes will be shown in regular widescreen with full black bars at the top and bottom. If you have seen any of the movies in the cinema you may have already experienced the IMAX presentation (which can be even taller in the cinema). 

- "For more than a decade, IMAX has helped filmmakers take fans across the Marvel Cinematic Universe in theaters and now that epic journey crosses into a new world: the home," said Rich Gelfond, CEO of IMAX. "IMAX, Disney, and Marvel Studios are giving the fans what they want: the most immersive viewing experience throughout the life of a Marvel Studios film, from exclusive theatrical release to the library at-home where they can now watch the Avengers assemble with more picture than ever before."

The press release did not state which HDR format the IMAX versions will rely on but it is most likely HDR10. Update: It's Dolby Vision.

The 13 Marvel movies will automatically play in the IMAX Enhanced version. This is in addition to the regular widescreen version in 4K Dolby Vision and Dolby Atmos, which will also remain the default premium formats for other movies and series on Disney+. You can select between the two versions manually from the movie page's 'Versions' tab.


 You will be able to pick which version you want to watch

Immersive DTS audio
IMAX Enhanced will also bring immersive DTS audio to Disney+ in the future. It sounds like we should expect Disney+ to use the streaming variant (compressed audio) of DTS:X but it is not entirely clear from the press release.

- "DTS is proud to be an integral part of IMAX Enhanced and we are looking forward to unlocking more exciting technology for Disney+ subscribers in the future, which will include immersive IMAX signature sound by DTS," said Jon Kirchner, chief executive officer of Xperi.

 Also read: Disney+ Day: New movies, series, trailers and $2 introductory price

It was confirmed that "all Disney+ supported devices support IMAX’s expanded aspect ratio". However, to fully enjoy all of the new and upcoming IMAX Enhanced features on Disney+ you will most likely need to own a 4K TV that is IMAX Enhanced certified as well as a capable sound system. Sony and TCL are the first TV brands to advertise IMAX Enhanced support. Sony is offering IMAX Enhanced movies through its Bravia Core streaming service but Disney+ is the first major streaming service to support the initiative.

Expect the IMAX Enhanced features to show up on Disney+ Day (November 12). As part of the promotion you can get one month of Disney+ for $2, £2 or €2.

Marvel movies in IMAX Enhanced on Disney+
- Ant-Man and the Wasp
- Avengers: Infinity War
- Avengers: Endgame
- Black Panther
- Black Widow
- Captain America: Civil War
- Captain Marvel
- Doctor Strange
- Guardians of the Galaxy 1 & 2
- Iron Man
- Thor Ragnarok
- Shang-Chi and the Legend of the Ten Rings


FAQ: IMAX Enhanced on Disney+
In Disney's own words:


What is IMAX’s expanded aspect ratio?
IMAX Enhanced content on Disney+ features an expanded aspect ratio of 1.90:1. This differs from most films where the picture appears wide but does not take up the full height of your screen.

IMAX’s expanded aspect ratio allows you to see up to 26% more of the original image and experience the full scale and scope of the picture from the comfort of your home or on the go. Some movies only have selected sequences filmed in IMAX’s expanded aspect ratio.
 

Do I need special equipment to stream in IMAX’s expanded aspect ratio?
No! All Disney+ supported devices support IMAX’s expanded aspect ratio.
 

How can I find movies available in IMAX’s expanded aspect ratio?
Type 'IMAX' in the search bar or use the IMAX Enhanced filter on the movies page to see all movies available in IMAX’s expanded aspect ratio.

Selected movies will also have a Versions tab available, where you can access both the IMAX Enhanced and Widescreen versions.

Note: Some movies only have selected sequences filmed in IMAX’s expanded aspect ratio. Read the description in the Versions tab to see if the expanded aspect ratio is available throughout the entire movie.
 

How do I stream selected movies in IMAX’s expanded aspect ratio?
All Disney+ subscribers can experience selected Marvel Cinematic Universe movies in IMAX’s expanded aspect ratio, on any supported device.

These movies will automatically play in IMAX’s expanded aspect ratio during the full movie (if available) or during selected sequences that were filmed or formatted for IMAX, but the standard Widescreen versions will still be accessible from the Versions tab.
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 - Source: Disney, IMAX, Xperi, Engadget