Post here if you get in and also post about your account status if its Premium or not. Reason being is that they wanted us to do the challenges in order for us to be eligible for an invite. I personally never focused on that and just continued playing the way I always did. I know that some guys have been going all out and trying to complete them every day. My feeling is that they will give it to anyone who is active and/or has a Premium account.
I hope that you get it. I remember Shrugz was doing a weekend challenge where he had to take out like 400 ground units to be eligible to win something. He got it done and didn't get shit for it. That was months ago but still. After it happened and than I saw this whole ground forces challenges come out, I was like, whatever.... It's great to see that they're making this game event based. Every day something new. This will always give players something new to do which most of the time is fun.
