It has a keyboard. That makes it infinitely more interesting to me than a Nexus 4. I bet a lot of (former) N900 users will agree. While I never used an N900, I've used phones with and without keyboards over the past few years, and I'm not settling for a touch-only device.
There's also more and more of the base Android apps that are abandoned in favour of closed-source, Google branded apps. So there's that as well.
There's also more and more of the base Android apps that are abandoned in favour of closed-source, Google branded apps. So there's that as well.