Update 1/26 at 4pm: Yep, that little yellow dot is indeed a Legion flight ring. Newsarama has a high-res version of the picture.
In case you haven't seen it yet, DC released a promo image for... well, something. Speculation seems to be that it's related to either the upcoming WWIII (from 52) or from the rumored weekly comic called Countdown as the 52 followup.
"Let the battle cry be heard in the land, a shout of great destruction."
There are no Legionnaires in it, unless you
The reason I'm posting it here is that speculation seems to be leaning towards this representing (among other things) the return of the Multiverse: there are characters from the former Earths-1, 4, S, and 8, plus a couple in old costumes, plus some Elseworlds characters. Are there going to be 52 Earths? There are (probably literally) dozens of Legion continuities to choose from...
On the other hand, the last time I tried some future speculating in here a year ago, I posted some guesses that turned out to be just a bit off. They included someone thinking that Superboy-Prime would end up in the 31st century as the new Mon-El, and my thought that the current Legion would be revealed to be the post-Infinite Crisis Earth-2 Legion (with the post-Zero Hour Legion as the Earth-1 Legion). Well, that last one might still have some ring of truth.
Follow the discussion on CBR and Newsarama, and keep watching the skies...