This is a little odd. Marvel has been issuing two kinds of teasers lately. One is the vague and mysterious ones that just contain a single word plus the creators. The second has been for a current Marvel NOW! title featuring a new artist (most likely rotating in as the first artist takes a break from the twice a month shipping schedule). This next one doesn't appear to be announcing anything new so you have to wonder why it's been released?
Whatever the reason for releasing this, we know that now, the GAME is ON. Maybe it's a turning point and Arcade better watch his back. Or maybe the kids in AVENGERS ARENA have finally accepted that they have to play by his rules.
We'll find out in April.