Sega has released on Steam the Company of Heroes 2 demo that was showcased at E3 earlier this week. You've read about it here and elsewhere, so now you can play it for yourself.
The demo is a part of the game's single-player campaign and comes from a mid-game mission called "The Land Bridge to Leningrad" in which players will be asked to cross a frozen lake under heavy German fire. The demo is a portion of the full level included in the retail version of the game.
The demo will be included as a part of anyone running the Open Beta on Steam. Players who have the beta installed will have their games automatically updated and notice the CAmpaign button on the title screen is now unlocked. Clicking on it will take them to the mission select screen where the demo can be played.
New players will have to opt into the Open Beta, which you can find here.