I was somewhat interested in the Xperia Pro as a potential replacement device, depending on how both Harmattan and the potential AT&T acquisition of T-mobile USA played out.

I was mainly interested in the high-ish spec'd camera + physical keyboard combo. However, reviewers of the Xperia Arc & Neo (both with the same camera specs, I believe, as the forthcoming Pro) have generally been disappointed by the imaging quality, relative to the hype.

So for now, I'll wait until something better comes along. The N900 should meet my needs for the foreseeable future.

Edit to add: the just-announced Milestone/Droid 3 also looks like a potential option if you are looking for an Android handset with a higher-end cellphone camera (8MP) and physical keyboard