Not sure what the value to me is of HDMI 1.4, though admittedly haven't thought it through. 3D is some years away from worthwhile home use for many reasons, and I'm sure the transmission standards will have changed by that time. Ethernet over HDMI? Don't see the big deal, but might well be missing something. As for greater bandwidth, I expect that to be well ahead of the software for quite awhile. Gaming maybe, but 4K movies files won't be on a disc, and the availability, methodology and bandwidth to download them is also distant, to say nothing of any kind of user base w/4K pjs.
Thinking out loud here before really thinking, but why is HDMI 1.4 important? Seems like just another stop in the road and not a particularly compelling one.