This relates to the 2xBlu-ray+1xDVD set: There's plenty of extras although these are on Blu-ray disk 2 only. The third disk is the standard def DVD containing the film and a welcome portable digital copy for iPod type players [iTunes or 'Play-for-sure' compatible portable players: English audio only and no subtitles].
Regarding the extras and languages supported, Blu-ray disk 1 has English 5.1 DTS, HD master audio, French, Italian & Spanish 5.1 Dolby digital audio, commentary track [surround], audio descriptive track in English 5.1 Dolby Digital [Film only], subtitles: English+English SDH, Danish, Dutch, Finnish, French, Italian, Norwegian, Spanish, Swedish. Commentary subtitles in English, French, Italian, Spanish, run time 124 minutes. It's 2.35:1 amorphic widescreen and the movies rated 12 [for moderate violence and `bleeped' strong language]. Main special features include: 'S.H.I.E.L.D. data vault in-depth look at the Marvel Universe' [HD], commentary by director Jon Favreau.
Blu-ray disk 2 has the Blu-ray special features that include 'Ultimate 4 part 'making of' documentary' [HD], 6 behind the scenes featurettes including creating Stark Expo and the origins of Black Widow and War Machine [HD], 8 deleted scenes [HD]. Disk 2 is English stereo, subtitles English, Danish, Dutch, Finnish, French, Italian, Norwegian, Spanish, Swedish. There are a few other minor extras as well on the two Blu-ray disks, and the disks are probably region free.
The universal play standard-def DVD disk 3 is 2.35:1 amorphic widescreen, English 5.1 Dolby Digital [main film], English stereo [digital copy], subtitles English & English SDH only (main film), run time 119 minutes. This standard DVD is region 2 locked.