No, you're paying for the full game release - in essence you're pre-ordering and then getting to play in the first third or so of the game content early, as they continue to develop new elements and tweak/balance existing ones. Then when full release is ready you'll be patched up to full 1.0.
Thats what I had thought when I first heard about EA. Never purchased a EA game before. Thanks Tyndaleon for the heads up.