DCS 1.2.7 is being released as an Open Beta first.
It installs side by side with your normal install and will use a separate directory for configs, etc. so it won't wreck any of your stable stuff. Just lets you try out the new version and help find bugs and see what's coming if you're interested.
http://www.digitalcombatsimulator.com/e ... open_beta/
http://forums.eagle.ru/showthread.php?t=117732
DCS Open Beta
Moderator: RLG MGMT Team