I didn't get invited to the Beta, but I did download the Beta client.
Here is a page that explains how to get replays working. You can also look for a program called
lazylaunch2, which will allow you to actually play the game, but No SP campaign and no MP. You have to download maps that have AI enabled on them in order to play against some really crappy computer AI opponents. But it's better than nothing.
Kaffis, they may, in fact, incorperate APM (Actions per minute) in the match selection process, as that is one of the "stats" that you can view during replays. Not really sure how the match making system is going to work at this point.
I've been watching a bunch of replays and I'm even more excited about this game than I was before. Terrans are hella fun so far. Marines, Marauders, and Medivacs (M+M+M) are turing out to be extremely versatile and effective. Naturally, there are counters to this, but it's very easy for the Terran player to trainsition or adapt to something else. For instance, each Terran military unit building (Barracks, Factory, & Starport) has 2 possible add-ons. Tech Labs enable more advanced units to be produced and also provides upgrade research. And Reactors allow you to produce 2 units at the same time from the building it's currently attached to. But the best part is, they are interchangeable. So you can use a Reactor with Barracks to mass produce marines, 2 at a time. But then you can lift the barracks up, and swap in a starport/factory
to the same reactor add-on to easily switch to mass producing Hellions or Vikings/Medivacs! Hella cool!
If you don't wanna jump through all the hoops to enable replays, you can watch a lot of replays from Alpha/Beta footage on youtube. Some things have changed (like Nighthawks name change to Ravens), but you can still get a good idea of how each race is coming together. Also, much of the talk on many of the beta forums seems to indicate that the 3 races are balanced pretty well at the moment. Which leads many to think that the beta will be shorter than anticipated. But who knows for sure. This is Blizzard, after all. They'll release it, "When it's ready."