Right. I'm sure it'll probably have the same trial licensing as the Windows version, when it is closer to "fully baked". But, by then, the early-bird pricing will be long-gone.
Taking the early-bird price is absolutely a risk. They're TELLING us it is going to be half-baked for a while (Alpha/Beta quality). But, on the other hand, you'll get to help them improve it. If you're looking for something that is essentially trouble-free, then wait a few months and check back. If you're willing to live on the cutting edge (and be frustrated here and there), in order to help, then you get a 1/2 discount for your trouble. But you have to risk it.
That's the deal.