That RUSE beta was fun for the people who managed to get in. For everyone else (and those who might have missed any details of the beta), there's the beta hands-on preview.
A short snip from the article:
"Before you say "oh noes, not another WWII RTS", be aware of what they are attempting to achieve with the game. The whole point of RUSE is to trick your opponent into thinking you are doing something you are not. During WWII the allies utilised cunning methods to trick the enemies into thinking they were better equipped than they really were by deploying dummy tanks for example. RUSE adds elements such as this and other tactical features to keep the enemy at bay and lead you to victory."