As many have stated, all 2013 receivers do HDMI 1.4, which only produces enough bandwidth to support 30 FPS, in 4K UHD. In order to get the 60 FPS, for gaming, sports, or if you want 3D in a higher resolution, then you need HDMI 2.0 or Display port 1.3. Current receivers will NOT pass through these higher bandwidths, because the current HDMI hardware will not support it.
To better understand the differences, please see the link below
http://en.m.wikipedia.org/wiki/HDMI
http://www.digitaltrends.com/home-theater/hdmi-2-0-explained/#!y3usK
As someone mentioned, BD players will start coming out with two HDMI ports, as they did when HDMI 1.4 was released. One port will be HDMI 1.4, and the other will be HDMI 2.0, so all HDMI 1.4/1.3 compliant receivers can play the audio portion and the TV can support the video portion.
This doesn't help if you want to use your receiver as your central hub, for all AV, or if plan to use your AVR to upconvert your low resolution video to something higher. Also, for those who use CEC, the HDMI 2.0 compliance requires all devices to support this standard. Now if you turn on your BD player, it will turn all other HDMI 2.0 supported devices.
If you review the included link, you will also notice that the amount of audio channels also increased. Unless you have a high end audio room, most consumers will never utilize this, nor will most standard AVR manufacturers put enough processing power to support much beyond 11.2.
I am also in the market for a new AVR, and want to buy a new AVR, but know it is best to wait.
Next, consider that no announced TV or projector currently has HDMI 2.0 support, so if you are crazy enough to spend $9K for one of those cool curved TVs, you are going to kick yourself later. This is not the case if Samsung follows through on the rumored plan to release a new board that upgrades their newest 4K UHD sets to accommodate and support the new HDMI 2.0 standard.
I am glad to hear there are a few vendors announcing new receivers, but the sad truth is most large AVR vendors announce their lower end first (End of March/Beginning of April), and then announce their higher end towards October/November.
Bottom line, current receivers are over priced, especially since the industry is going to dramatically change, so it can support true 4K UHD. If you want to future proof your purchase, for at least five years, then you need to wait for receivers that have HDMI 2.0.
If you are one who only cares about the acoustic qualities, or If you change your AVR every 3 years, then you are going to have some great deals come to the markets as early as next month.