Latest rumors I've heard. AMD did rebrand some 7 series cards (mostly) as "OEM 8 series", but they are cards already out.
AMD is pushing hard to get either the next top end or top of midrange out before Cmas. They might make it. NVidia is trying the same, but more likely to be early 2014. Either way as someone else pointed out there shouldn't be a die shrink with these cards so performance probably won't jump much. Unless someone is willing to greatly increase size of the chip, which will drop yields.
Wait nearly a year to get similar performance? As already mentioned just buy now. Waiting isn't going to get you much.