Just had a quick peek to see if Canon were bringing out anything new and it looks like they've launched a couple new multifunctionals.
MX310
MX700
As far as I can tell the main difference between the two models is that the MX700 has a faster print speed (same resolution) and has wired LAN connectivity which is a first for Canon and not a moment too soon!
In terms of other differences it's hard to say although these units do seem to have a noticeably lower height profile compared to the MP830.
I somehow doubt I'll be getting my hands on one of these to play with anytime soon but if anyone else does, please post up a review.
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Printers: (Canon) MP500/830, MX700, iP4000/4200/4300/4500/5200, iX4000(A3) (Epson) C84/86, D88, CX6600, R285/800/1900 (HP) K550, K850, K5400, L7680