We wont actually know til Black Friday here in about a week. Im sure there will be a few sales on the 970's and 980's but considering that they are literally flying off the shelves at the prices they are now, I wouldnt expect them to drop much more than a few bucks. The 290's and 290x's might be a different story. Might see them drop an additional $20 or $30.
GPU prices are pretty awesome right now and there is the most bang for the buck to be had than I can remember in a long time so even if there arent any outstanding deals on Friday, now is still a great time to buy a GPU.