Buying HDMI 1.4 to REPLACE what you already own is absolutely silly.
HDMI 1.4 despite the claim that it can handle 3D, doesn't offer higher bandwidth on paper than HDMI 1.3 does. Apparently there is a channel there for 3D information in some form, and it offers audio return and Ethernet...
So, if you are putting in new gear, and are cabling a room behind walls for the first time, or just buying for the first time, then HDMI 1.4 isn't a bad way to go.
But, if it's all installed, unless you are going to HDMI 1.4 gear, and you already are fully cabled with HDMI 1.3, then you are just wasting money by replacing the cables. Makes absolutely no sense at all.
Wait, replace your receiver, TV, and BD player with HDMI 1.4 gear, then you will finally have a full HDMI 1.4 chain which can utilize the 1.4 cables.