HDMI 1.3 will do 3D at 1080i, not 1080p. But that's down to the HDMI 1.3 chipset. There's no bandwidth increase between 1.3 and 1.4 cables, just the extra channels such as ethernet. So a good 1.3 cable should work as well as a 1.4 cable (apart from no ethernet). Interestingly, the highest video bandwidth is at 2560x1600, supported by 1.3. 4Kx2K, new to 1.4, is about 20% lower.
Although 1.4 is due "real soon now", a couple of 3D options are delayed until 1.4a. (Er, or not. I can't remember.)