Your iPhone 4 is still in the game. Just wait for the 5 next July (back on schedule) If you still holding a 3gs and are mad, you shoulda got the 4 in 010. IMO gaming on the iPhone sux anyway. More money for the PS Vita.
Yep. As Microsot said, there's not much benefit for dual core yet and thats why they pushed for higher clock speeds rather than dual core in Mango launch phones. Better performance and better battery were the reasons.
Has your OS ever run more than one process at a time? (Hint: The answer is "yes") If so, multi-core processors are for you. Multiple single-threaded applications take advantage of multi-core processors at least as well as (if not better than) a single multi-threaded process.
What? There are no Dual Core WP7 devices to compare the battery life to so how are you saying that? You are confused, guy.