Heh, Yeah, I can see them teasing the game through a CG trailer or a Live Action one (like TEW).
One thing seems weird though, if Tango's project has just finished the planning phase, how come John Harker claimed he've seen stuff from TEW2 a while ago? I mean, from the looks of his previous rumors, he isn't affiliated with Bethesda (He had some Nintendo, Dark Souls, CoD related tidbits, amongst other things). So I guess he is affiliated with either one of the console manufactures (Sony/MS), or a high position in one of the big retail franchises.
Question is... Would a private company like Bethesda show around concept from a game (still in it's planning phase) to console manufactures or retailers? Doesn't seem likely to me...
What if... Tango had two projects. One that is TEW2, which is further along... And one that is a new IP, which kiri refers to as just entered mid development. I mean, Mikami's first goals when he made Tango was to have multiple teams working of multiple projects inside the studio, so maybe it's finally happening?
Hope we see something at E3.