Stumbled in here yesterday, I must say the discussion quite differs from the usual "uh, can't wait". My 2 cents:
I principally agree to the statement that the Beyers we have known until now aren't exactly technically advanced peaces of gear that are to be adored in the way of a W5K or so. Their strength is rather to be found in the field of sheer musicality, but their genre bandwidth is too restricted to have a large discipleship. Rock, Jazz & Classical only work acceptably IMO, but Ambient, Drum & Bass or IDM is quite a worthwhile experience with most "better" Beyers.
I didn't like the HD800 and most e-stats due to lacking musicality, so if the T1 really turns out to be a super-high-res DT880'600 with bass worth mentioning, that's a highender of my liking.