At this point it's far too early to jump in. Anything you need HDMI2 for is still for the early adopters. Anthem is not exactly a company for those people, so one year more at least. There isn't a single 4k TV out there I would buy (OLED is way too expensive and not mature enough, and an LCD won't cut it), and there won't be for quite some time, not to mention actual 4k content, or the fact you can fit 4k movies through HDMI1.4 (just 30 fps ones, but HFR movies are even more scarce than 4k ones), I can only agree with Anthem's pace here.
Hopefully we get more video processing for it too, it would be very logical to have AVRs marketed with their good FHD -> UHD upscaling capabilities.
2-channel is just multichannel done badly. - Frank Derks