I'm also waiting for the 4810.... I think.
I'm very happy with the 4310 which replaced the 5308... I call that a backward upgrade
Not really an upgrade obviously but the 4310 is doing a good enough job that I decided to sell the 5308 at a decent price, almost what I paid for it, live with the 4310, which isn't hard to do, and check out the 4810 when it comes along.
What I'm really looking for in the 4810, or maybe something else, is a unit that will give me 5308 performance, sound quality, video processing, connectivity, etc..... with a few upgrades along the way, HDMI 1.4, updated GUI, DPLIIz, Audyssey DSX, etc.... all for less money then the previous generation flagship....