Updated December 17, 2010 - some clarification on the 2 specials.
Updated December 19, 2010 - Magazine Scan from Ube's blog.
Updated December 23, 2010 - Changed the description on the 2 Sasuke specials.
Video Clip of Chiyo-Chan from Azumanga Daioh
With what seems like forever. We are finally getting solid information on Sasuke 26 on TBS in Japan. It started off with TBS finally revealing the date for Sasuke 26 in Japan despite G4's airing of the Sasuke tournament well before TBS (by a week and a half) - ANW 10 finalist only btw.. the real tournament is in March, 2011 on G4) late last week. The tournament itself was recorded way back in October, 2010. Lost in Ube has been on top of everything for the past 2 months and has the updated list of confirmed competitors. He's been scouring the Internet to find what can be found. With Sasuke Maniac off the air.. we have to rely on blogs, websites like Sasuke Mania and Monster 9 and TBS page which are finally up!!
Here is the official information:
大変お待たせいたしました! Thank you for waiting very much!
SASUKE2011の放送が決定いたしました!
SASUKE2011 decided that broadcasting!
2011年1月2日(日) 21:00~23:39 TBS系列
January 2, 2011 (Sun) 21:00 ~ 23:39 TBS series
That is 9:00 pm - 11:39 pm Japan local time
(TIMEZONE CONVERSION)
7:00 am - 9:39 am Eastern time
4:00 am - 6:39 am Pacific time
Sunday, January 2nd, 2011
また、事前放送&再放送も決定!
The decision also re-broadcast and pre-broadcast! ! !
こちらの情報は決まり次第こちらにて告知いたします。
Information will be posted here as soon as they here in.
お楽しみに! Have fun! !

Now.. there are 2 specials have have been added as part of the lineup:
1月2日の放送に向けて、2本の事前番組が放送されます。
For the January 2 broadcast, the show will be broadcast in advance of the two.
ぜひご覧ください! Please look! !
**********************
(Special #1)
「1月2日は新春歴史SP&SASUKE!!」 "The history of New Year January 2, SP & SASUKE!!"
2010年12月29日(水)8:30~9:55(関東ローカル)
December 29, 2010 (Wednesday) 8:30 to 9:55 (local Kanto) (airing only in the Tokyo greater area)
(TIME CONVERSION)
6:30 PM - 7:55 PM Eastern time
3:30 PM - 4:55 PM Pacific time
TUESDAY, December 28, 2010
EDIT: Time shared with another show.. Time for Sasuke might be shorter than normal...
**************************
(Special #2)
「1月2日夜9時放送!!SASUKE2011直前特集」
"Broadcast the night 9:00 2 月 1!! SASUKE2011 Special Deals"
2010年12月31日(金)10:50~13:50(関東ローカル)
December 31, 2010 (Fri), 10:50 to 13:50 (local Kanto) (airing only in the Tokyo greater area)
(TIME CONVERSION)
8:50 PM - 11:50 PM Eastern time
5:50 PM - 8:50 PM Pacific time
THURSDAY, December 30, 2010
EDIT: THIS is a rebroadcast of Sasuke 24
Mental warning about the Specials as well. BOTH air during the Japanese daytime.. that means that everyone in the United States sees it THE DAY BEFORE. Note the times and use the conversions as needed.
(Same information can be found on the Monster 9 website)

EDIT: I asked TBS this question and it seems it's all new content and no repeats of previous content! So it's basically one huge navi and a very possible history special! Hurray!
EDIT: Booooooooooo.. the first special is being shared with another show entirely and the 2nd special IS a repeat.. it's Sasuke 24 though.. so I guess they are celebrating Yuuji's win? More crying from Yamada I'm sure though.. he was the idiot who bitched about his shoes..
For the full list of confirmed competitors please go to Lost in Ube's page!