There is no answer to your question. There are no details. Very annoying. I have got the the Director's cut on Blu Ray from Amazon.france. It is a French blu ray. It contains the 4 hour version and all the extra features from the special edition DVD. It has the French dubbed version and English with French subtitles.
I've just had a look on the BBFC website, and they have only classified the theatrical cut (on 2nd October 2009). Not sure if this blu ray will be the extended version after all, but then again Amazon has moved the release date back by over a month so there may be another change to come. I really hope this will include the extended. Won't be getting it if it doesn't.
Shame on you people, lots of time has passing by but no one had answered to this topic. The D"ances With Wolves [DVD]  " version is like that: 2:35:1 5.1 digital sound Run Time 173 min languages: English Italian Subs: English/Danish/Dutch/French/Finish/Italian/Norwegian/?Swedish
I have the German bluray version which is very good .also I have the 3disc extended version in DTS sound and identifying where the extended addition is inserted to the story that shows what happens to the soldiers at the outpost .it brings the story together much more than the theatrical version does and sound superb in DTS surround .