A new update has been released today for the CS:GO Beta. Popular hostage rescue map cs_office is now playable in the beta. All CS:GO servers are now running the following map cycle: de_train, de_nuke, de_inferno, de_dust, de_dust2, cs_italy and cs_office. Several new weapons have also been added, these include: the sawed-off shotgun, XM1014, Mag7 and the Negev.
A blog post on the Official CS:GO Blog has been posted which explains the movement issues in CS:GO and what is being done to fix them.
Movement is a hard problem, there are many factors that come into play and both CS:1.6 and CS:S movement have very different feels.