HDMI Cabling
HDMI 1.3a
Released 22 June 2006 - Increases single-link bandwidth to 340 MHz (10.2 Gbps). This requires a cable designed for these higher bandwidths. All previous versions used the same HDMI cable. HDMI 1.3 and HDMI 1.3a use the same connector as HDMI 1.2a
Although this spec is not in the mainstream today, all future developments will likely require the additional bandwith. The question seems to be:
Do you pay for the bandwith today, one time; or pay for the cheaper spec today and again in the future for the bandwith (10.2 gbps).
Only you can access the relative merits.
Hope this helps.