well as a n800 owner I can say that we saw enough - i.e. from chinook to diablo with many minor releases.
Of course we didn't get the E release because it was skipped for YOUR Fremantle so don't ask us (previous tablets owners) about your updates

I guess, since we still have people working on updating and improving the n800 - n810 tablets the - more popular - n900 will get enough attention in the following years.