AAK on the Neogaf forums has confirmed at least a roster of 43 characters after extensive testing and reports from the Tekken Tag Tournament 2 (TTT2) arcades locations at Namco Land Kawasaki and Namco Land Umeda. The arcade banapass card costs 300 yen, but it stores all of the player's data for stats and competitions. Also of interest is that the Deluxe cabinet apparently costs 4,180,000 yen, which is upwards of $50,000US (no wonder our arcades can't keep up?). You can examine the thread at Neogaf further for more information, though much of it is so steeped in fighting game terminology that it confuses us and the English language.
Here is the list of confirmed characters:
Alisa Boskonovitch
Anna Williams
Armor King
Asuka Kazama
Baek Doo San
Bob Richards
Bruce Irvin
Bryan Fury
Christie Monteiro / Eddy Gordo
Devil Jin
Feng Wei
Ganryu
Heihachi Mishima
Hwoarang
Jack-6
Jin Kazama
Jinpachi Mishima
Julia Chang
Jun Kazama
Kazuya Mishima
King
Kuma / Panda
Lars Alexandersson
Lee Chaolan
Lei Wulong
Leo Kliesen
Emilie De Rochefort
Ling Xiaoyu
Craig Marduk
Marshall Law
Miguel Caballero Rojo
Nina Williams
Paul Phoenix
Raven
Roger Jr
Sergei Dragunov
Steve Fox
True Ogre
Wang Jinre
Yoshimitsu
Zafina