The latest Famitsu issue has revealed the new RPG that Tri-Ace was teasing us with last week. Apparently, the game is called End of Eternity and Sega seems to be the publisher. The game is being developed for the Sony PlayStation 3 and Microsoft Xbox 360.
Since I can't read Japanese, that's pretty much all I could gather from the scans. Oh, one of the scans shows a URL - EoE.sega.jp - but going there just redirects you to newrpg.jp, the same teaser site put up by Tri-Ace. You can check out more scans at the source link.