When the N9 was just released in Denmark I had an issue with my N900's jack stick or so I thought as it turned out to be the headset. The point is i talked to Nokia Denmark about a possible replacement and first it sounded like I could get a N9 if they couldn't fix my N900 (talked with Nokia before I found out it was the headset, only had other mobile headsets wich didn't work with the N900. It was when i hooked it up to a friends external speaker with the jack stick I found out, I only used the FM transmitter at home to listen to music), but the Nokia guy kind of laughed when I asked directly about the N9 being a replacement and he answered it was a brand new smartphone, so no and it would be something else but he didn't know what.
So I don't think they're gonna give a not yet released smartphone as a replacement for the aging N900, would be cool though (if you want a L920/820).
Another thing wich phone out there can really replace a N900. I meen there truly ain't no phone out there that can do the same as the N900 (here I'm talking the whole easy debian shabang, mypaint and what not, not the usual mobile story, rooting, ssh, OC'ing etc.)
So if you're lookong for the same experience you're pretty much f****d, unless you take what ever will give you the best resell price and go for another phone wich suites your needs best or go for a refurbished/used N900 if you're still hooked on it.

Dousan...