That's a great decision on their part. However I really hope they reconsider the removal of ActiveSync support aka Google Sync. Totally anecdotal, but my wife is not a fan of the official Gmail iOS client which is their current solution for push email, and IMAP works OK with the stock Mail app for her except for the lack of push. I'd be OK with paying for Google Apps account to get ActiveSync back, except that you can't do that with a Gmail address.
I thought the reason for the activesync/exchange shutoff is that it had to be licensed. aka that google paid microsoft for being able to use it? If so maybe it isn't worth it due to a licensing increase or just not used by many people (for some value, google is crazy about numbers guiding decisions).
Gmail's IMAP supports the IMAP push extensions. I don't know if Apple's Mail app supports them or uses them, but just because it's IMAP doesn't mean it isn't push.