Supposedly they're having trouble with the creatue AI. Read the FAQ of what they're shooting for and you get an idea of just why its taking so long. In a nutshell its very very ambitious.
Also, they seem to keep finding reasons to NOT show the outdoor DX9 stuff which leads me to beleive thats another problem they need to work out.
I don't fault them for pushing it back though. I'd rather see the game done right rather than have some empty suit force it out to cover their quarterly finacial projections for shareholders.
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Sacred cows make the tastiest hamburgers
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"Both the “left” and the “right” pretend they have the answer, but they are mere flippers on the same thalidomide baby, and the truth is that neither side has a clue."
- Jim Goad