UPDATE 04/04/2013: The beta is now available to everyone who pre-ordered COH2 on Steam!
Sega has announced that the Company of heroes 2 closed Beta will start on April 2, and will be open for ‘eligible pre-order customers only’. There also will be a second phase in the ‘coming weeks’ where a wider audience will get a chance to take part.
The Beta will give players access to six maps, v1, 2v2,3v3 and 4v4 competitive gameplay and the ability to play alone or with teammates against the AI. They will also get access to the first 40 levels of progression, and will be able to customize their loadouts using the new ‘Army Customizer’ feature.
Source http://www.pcgamer.com/2013/03/28/company-of-heroes-2-closed-beta-starts-next-week/ and http://blogs.sega.com/2013/03/28/company-of-heroes-2-closed-beta-begins-next-week/