Reports we're getting in the mail say that some Gmail users have seen their storage bumped to over 9GB today - 9030MB, to be exact. If not a glitch (and why would it be?), it means Google is playing catch-up with Yahoo, which now provides unlimited storage.
With no other info, we can only assume the accounts are currently being selected at random. As someone who is just about to exceed his Gmail limit, I'm keeping my fingers crossed.