iPad 4 vs. iPad 5

I understand that the new ipad 5 is going to have the new design and maybe a fingerprint scanner and whatever, i'm also pretty sure that it will include the new 64-bit processor that came with the 5S. I'm thinking about buying the iPad 4 once the 5 comes out, because of price cuts, but I am worried that the A6X isn't going to hold up half as well as the A7X. Do you guys think that the iPad 4 will be able to handle software updates in two years like iOS 9? Because the only reason I would have to get the iPad 5 is if this was the case.

Thanks