I was particularly interested in the stereoscopic 3D.
If I understand what I've been reading, The 1.4 spec supports 3D in both interleave and side-by-side in both 1920x1080 and 1280x720 frame sizes at standard frame rates. I assume (note: I am not a programmer or silicon designer and do not know what I am talking about here!) that would not be a big deal with existing BM HDMI equipped cards. The spec also mentions some new frame sizes, though. The larger frame sizes would not only require faster drive arrays, they would require new high speed HDMI cabling.
And at some point, someone is going to ask me about 4k, which is also supported by the 1.4 spec. Actually I get one or two calls a year about 4k, now, but I can wiggle out of it by explaining that it's not supported by anyone.