More details are now out on the DW Specials Boxset, due to be released in North America on February 2nd (January 11th in the UK) - there'll be 5 discs in total, and will contain all 5 specials, in addition to over 7 hours worth of special features.
*All info is from tvshowsondvd.com - ie NOT MINE!
Sorry for the thumbnail pic - this won't be the final artwork for this particular offering (ie the vanilla DVD for EoT 1 & 2), but I thought the pic was way cool and had to share. I'm loving the stormclouds. *crosses fingers that this'll turn up in a larger pic at some point*
The bonus material listed thus far clocks in at over 7 hours, and includes the following:
-DW at the Proms
-The DW Confidentials (apparently, the confidential for The Next Doctor is only available in the collection? Hrm.)
-Deleted Scenes
-DT's Video Diary: The Final Days (clocks in at 40 minutes and 40 seconds)
-The Christmas Idents (clocking in at a whopping 46 seconds, but still - YAY!)
-Audio Commentary
-Doctor Who at Comic-Con
More info here (WARNING FOR THE CASTING SPOILERS OF DOOM):
http://www.tvshowsondvd.com/news/Doctor-David-Tennant-Specials/13049