Thanks for the bad news. Sadly, the HDMI 1.3A spec is a deal breaker for me.
I would have choosen the 4810 over the 3007 that I was planing to buy, due to the 4810's height AND width (at the same time) DSX capability.
I need 3D BD capability in order to spend $3K on a receiver, for I know that I'll want 3D BD in my HT ASAP.
A 3D BD setup will cost $$$$$ for a player, receiver, and a projector. I plan on purchasing one piece of gear at a time (I'm not rich).
If the 4810 had HDMI 1.4, and if it was compatible with the BDA's upcoming 3D BD format, I'd get on a preorder list for one ASAP.
It looks like my first piece of 3D gear will be the upcoming Panny or Sony 3D BD player.
Until then, I'll keep using my cheap Mag 530 BD player, and my ancient Denon 2307.