SpCows.com

Here is some pages where you can order them and see the release dates as known so far:

Arma 2: (wiki)
DE May 29, 2009
CZ June 17, 2009
SK June 17, 2009
EU June 26, 2009
USA Unknown

Amazon.de - May 29, 2009
Amazon.co.uk - June 26, 2009
Amazon.com - Not available at all

Flashpoint 2: Dragon Rising: (wiki)
Fall 2009

Amazon.de - Not available at all
Amazon.com - September 30, 2009
Amazon.co.uk - September 30, 2009

So thats the release dates as known so far.
So I guess the first game we get is the German Arma 2, better go learn german you all!