A thread on the Steam forums seems to confirm that rumours about a new Counter-Strike game – Counter-Strike: Global Offensive – are true, with commenter “Cliffe” (who is Valve designer chap Jess Cliffe) saying “Global Offensive”. There have been a bunch of other references to it, on Twitter and so forth.
And update on the ESEA Facebook page reads “Counter-Strike: Global Offensive… More info in the morning.” So it looks like we can expect something later today.