The CS:GO closed beta is updated every Friday, and this week's update brings new content as well as a host of tweaks and bugfixes. The incredibly popular map cs_office has been added to the beta, and beta servers now feature a rotation of all the classic maps (Office, Italy, Dust, Dust2, Inferno, Nuke and Train). Four new weapons have been added: the sawed-off shotgun, the XM1014, the Negev and the Mag7.
Valve's official CS:GO blog post associated with the update discusses the hot topic of player movement in CS:GO as compared to previous Counter-Strike titles, an issue that is very important to the competitive community:
You can see the full changelog for the CS:GO beta patch on Steam here.