Of course not. They wouldn't give 20,000 copies of the game away for free to random people. If you got in the beta by pre-ordering, duh, you get the game. If you got the key, but did not buy the game, you do not get the game.
Yeah I assumed as such. Just needed confirmation on that ^_^
Also, I'd find it exceptionally weird if it would be possible that way, and bad for supporting the game. More beta players are better, though. So there are 120 keys left in there, hope to see most of them used well!
This was also posted in the kickstarter comments for people there who didn't have Dragon Commander in their tier, there just wasn't an update announcing it.