They did not send me a beta key either. So I'm in the same boat.
I've spent countless hours watching the replays with commentary on youtube, and yes this is going to be a great game. I played SC Broodwar a lot way back when.
There are things I don't like about the new version. But this is just a beta, after all. They are probably holding back a lot for the full release. The Single Player campaign looks good such hints as we have of it. The editor and modding tools are going to be a whole game in themselves. I used to mod the old SC a lot.
Be sure and check the news and the forums on www.sclegacy.com since there are a lot of highly experienced players on that board. sclegacy was keeping alive the hope of StarCraft 2 years ago when there was really no hope other than an idle remark here or there by Bill Roper or some other Blizzard honk. Plus rumors, my brother knows this guy whose cousin is dating one of the developers at Blizzard and she said ...