Maxwell is not coming out this year. No ETA and it might even get delayed. Especially if both companies keep fighting over the high end segment of the market.
If you want you could wait out towards the end of the year, as new cards R9 290 and GTX 780 Ti are coming out soon. Prices could further adjust (by going lower) in reaction to the release, and of course you can catch discounts for Black Friday/Christmas.