Agree with all. Some of those are not really important to me and some are.
I would be more than happy with 15mm with qwerty and 13mm without qwerty. I actually like the N900 keyboard alot, but if they can make it better with 4 row, why not.

OLED screen is something that i have learned to love with Omnia HD and with Zune HD so that would be great improvement for the future device and something i'm hoping to see. 3.7inch would be great, but if the device goes 4inch i don't want it to grow width too much. N900 size is great and i would like it to stay that way.

I would be happy to see N86 camera on the next Maemo phone and i'm pretty sure we will see that, but not a huge thing for me. Xenon would be great. You don't need to do anything else than to look at N82 direction to see the impact to low light pics.