I've been reading a lot and been hearing a lot of clamor for Nokia to release the N9 in markets that were previously reserved for the Lumia line. Just wishful thinking but I do think that Nokia has the basic elements of a successful phone spread out over several units (don't they always?). Anyhow, If Nokia were to release a new Harmattan phone without going back too much to the drawing board, here's what I'd definitely want: (Nokia N10/N9i?)

Hardware:
Lumia 800 body with the camera button
Non-Pentile Amoled screen
Latch-less charging port
Better/Updated CPU/GPU
Long Shots..I know.
Gyro
12-20 mpx with 3-5mpx Pureview
Xenon flash
FM Transmitter
USB-on-the-Go
Higher Cap battery

Software:
Wider range of video codecs
WP like speed and stability
Whatsapp, Shazam
Bug fixes, refinements etc.