Welcome to the club (almost...)!
I do not believe there is a three-month upgrade policy, but I could be wrong. Please let me know if I am.
This site (
When to buy) keeps track of the product cycle and predicts when is the best time to buy. This should help.
If you have other questions about switching, I just made a new Squidoo "lens" for switchers. I invite you to check it out (see iSwitched in my sig). Also, another good site for switchers (that I have no affiliation with) is switchingtomac.com.