Yes! I now have the 4K UHD IMAX version of trailer 1 for Black Panther: Wakanda Forever (2022). It has a few scenes in the IMAX aspect ratio, and also has the official 5.1 mix, which is encoded in DTS-HD Master Audio. There are six encodes available, including a lossless HEVC yuv444 encode and a multi device compatible .mp4 1080p version as well. Make your way to the Black Panther: Wakanda Forever (2022) page and check them out.
UPDATE August 2, 2022: IMAX versions have been updated to the correct aspect ratio.