Well, it's possible that the missing commentary track was a PR omission - but as Matty says, the UK has missed out on Disney commentaries in the past. The UK single disc "Roger Rabbit" being the most recent example (but again the commentary for Roger Rabbit is on the French release - go figure!?!)
Looking at Blackstar Listing for the Treasure Planet (
http://www.blackstar.co.uk/video/item/7000000080044 ) it again doesn't list a commentary.
More strange is the fact that the disc is not a copy of the Australian disc, featuring as it does Russian soundtrack and subtitles. (As did the UK release of "Signs" - another Buena Vista title) This makes me think it is more than possible that the commentary could be missing (before I assumed the UK release would be a copy of the Australian release)
Being as the Australian disc is in English, PAL format, is R2 compatible (one would assume from the soundtracks and subtitles listed), out now and cheaper then the proposed UK disc, I would recommend everyone imports the Australian disc, or they could go for the current French disc that fully supports the English language (but omits the trailers)
R4 Listing Here:
http://www.atlanticdvd.com.au/view.cfm?id=5465
R4 Review here:
http://www.allzone4dvd.net/review_details.htm?id=408
both confirming the presence of the commentary track
Ps. I've altered the title heading of this thread, as this could be a big issue for UK readers.