iPad 5 expectations

I was wondering if anyone knows any of the new features or specs of the upcoming iPad 5 that's likely to be released this September. I'm definitely looking into buying a tablet this fall, and the Surface RT is priced pretty competitively at the moment. I've always been an Apple fan, so I would prefer to stay with this ecosystem, as I have an iPhone 5. But I just find it hard to spend $500 on this new iPad if it's not going to wow me. Are we going to see a big refresh with this model or will it not sway me away from the tempting Surface? Any info helps. Thanks in advance.