As for me, OMAP5 seems to be bad choice because of their weird policy of restricting some things to "general purpose" devices and limiting HS devices only to huge vendors with NDAs.

And I dislike Qualcomm as it's more cellular modem than CPU. Sometimes I really want to get rid of cellular and I guess it's not something that is easy to achieve when cell thing boots first and only then UI CPU booted by it. Not to mention I have no reasons to trust to huge closed-source OS of cell phone which can have complete access to UI part and all it's resources.

As for me, Exynos could be interesting. As far as I can remember Samsung usually haves less of dumbrestrictions. At least I was able to find datasheet which explains all details of CPU including "secure boot" operation.

Tegra 3 also looks good due to powerful GPU (unfortunately very closed source one - potential source of troubles) and very cool idea with additional low-powered core. This could allow quite a good standby times while remaining fully operational.

Keyboard? I think it's smart to do 2 versions; one with keyboard and one without it. So everyone could be happy.

USB host is a real must. SATA is ... weird for phone.

Screen... as for me I vote for high-quality LCD. Because OLED would degrade faster. On other hand it consumes less power. Yet apple prefers LCDs and there are some reasons.

Battery... it's really handy to have replaceable one. Not to mention that when things are going wrong and battery goes fat, device could be completely destroyed if battery is not replaceable. As well as making it too hard to replace battery when it dies.

And sure, I would expect it to be N9/N900 successor for sure. You have to continue where Nokia nuts left. In fact it's very stupid move for Nokia. They finally started getting things right and... started to make dumb moves. Weird. Thank you Mr. Elop for destroying Nokia. Now someone smarter should have a chance.