We've already been promised support through Diablo*, so there's no way this is anything more than discontinuing of manufacture (this seems unlikely, too, though).

Really, there's no reason they would drop support for the N800 (and no real way, either), as the N810 and N800 are virtually identical.

*This might have some interesting consequences for N810 owners, will they only be getting support through Diablo too, or will Nokia extend support longer? Since you can't support one without supporting the other (basically), does this also mean more support for N800 users?