Marvel have unveiled (positively unleashed) a new teaser campaign at us, centred for the time being around the anonymous figures known as 'the Mystery Men'. These characters may well be new to Marvel, or old characters reinvented for some reason. They could be alt-universe, Crossgen, or have a connection to the 'real' 616 Universe. Heck, they could be the new Ultimates for all we know. But for the time being, all Marvel are willing to show us is this one picture.
Solicits aren't coming for a good few weeks, so the only way we'll be able to find out more is if this is one of Marvel's 'week-day campaigns', with new images every day this week. As it stands, this is all very mysterious and there's no way we can even begin to guess what's going on.