Today is the day.
Here is a new preview with scenes from more episodes than just the pilot. Possible evidence of Graviton briefly at 1:09 and the first footage of the red masked guys seen in Stockholm.
I've read that some folks on-line seem to think the red mask guys are U.L.T.I.M.A.T.U.M., but I've read nothing official to confirm that and they look nothing like the U.L.T.I.M.A.T.U.M. that I remember from the comics
, so I'm not sure what they're basing that on.