Just downloaded it and there's some interesting changes
Hint from relic:
There's a trick you can do to save some time if the DL size is an issue for you. If you go to the steam client, right click on Company of Heroes 2, then select properties, then under the LOCAL FILES tab select BROWSE LOCAL FILES. You'll find the game files here.
From here you can copy the "Company of Heroes 2" folder and rename the copied folder to "Company of Heroes 2 - Test Build".
Now go back to Steam right click on Company of Heroes 2 - Private Test. Select Properties, then local files, then hit verify integrity of game cache.
Steam will then check all the files and only give the the differences between the live game and Alpha.
If you have a good connection it might just be easier to let Steam DL for you though.
https://community.companyofheroes.com/discussion/comment/244241#Comment_244241