The announcement reads:
The invasion begins in Times Square TONIGHT @ 10:00, 10:20 & 10:40 -- Get an early first look at Crysis 2!
The accompanying SOSNewYork link directs users to a brand new Crysis 2 countdown site, which is currently ticking down to an undisclosed happening at 5AM PST on Friday, April 9th. Let the speculative anticipation commence!
Little has been revealed about Crysis 2 so far (beyond the screenshots above), but we know the title is headed to the Xbox 360 and PlayStation 3 later this year, in addition to the expected PC version.