Really? It didn't bill you for it? I would think you would get billed for it now because from the way I understand things, they will keep "Pixelmator" on the App Store (current 1.x and then 2.x) rather than making "Pixelmator 2" on the store (which would be a different app).

So, in theory, if you don't have Pixelmator at all, you should still be able to buy it for the $29.99 and get v2 later, same as anyone who had previously purchased it.