IMO the 770->800 split was due primarily the stark line drawn between the operating systems and what that did to developer support. I don't think the hardware bump itself had much to do with it (other than the 770 not really being able to deliver on the device's promise).

Given that the 800 and 810 will share an OS (and thereby implicit app support) I don't think you really had to worry about the same sort of split.

Keep on that track and I think you can safely add more hardware to new SKUs without huge backlash.

(I'm still waiting for the proper camera + internal HDD revision btw)