I really disliked the N9 at first, but I've read around a bit and thought about how it would fit with me.

-I'd definitely go for black + 64gb

-No hardware keyboard, though the screen is 3.9" and I'm very pleased with the N900 Vkey

-No widgets: This bothered me a lot, but then I found out that the calendar notifications and alarms - all of that stuff - goes in the notifications screen. Depending on how this information is presented and organized, I may be perfectly fine with this.
I would probably have a weather app and similar things open in the multitasking area and set at 4x4 when it's just idling to make up for that.

-Not having a launcher for just unlocking the phone -> phone app/sms/mms/calendar/alarm immediately without any side swiping is going to be annoying.

-I liked the settings menu of the N900 more not a huge deal though

-No wallpaper: except for the lock screen. God damn. Yeah it's modern and all that but I hope that it will get a hack for wallpapers.

-Old hardware: I don't get why this is such a big deal. Except maybe that it's an A8 at 1Ghz so I can't imagine it being any more overclockable. Nokia is very good at making software run well on low end hardware and this is not low end, it's just slightly older. Considering how well the N900 performed at 600Mhz I don't get why this would be such a big deal at all except for how nerds wont be able to wave their e-cock around with comparing hardware, completely ignoring the performance.

-WHY does the app menu get the same amount of relevance as the notifications and task manager??? Remember the N900? I barely went into the menu at all. The N9 seems generally very content centric to be honest, the UI only seems to serve the purpose of getting you from app A to B (though it does it very well). Unlike the N900 where you had widgets which allowed you to unify A and B's contents in a homescreen. The N9 does this via the 4x4 mode in the multitasker, but that hardly seems to be a substitute.

-I hope the browser gets flash. From the community or otherwise.

-I remember reading that you have to install x-terminal, that's going on there immediately. Luckily it's still a linux device, so I hope that the community that has made the N900 greater will make the N9 great.

-The whole NFC interaction with speakers and stuff like that is really cool. If I go for this I would definitely buy an NFC speaker (come home, press play on N9, tap the speaker to automatically broadcast via bluetooth -> instant chill mode)

-I hope that the screen glass is tough as hell, because there isn't a screen protector in the world that will go over that convex display :P

So that's just a few things. Looking at it from just my point of view, disregarding it's "future" (if Nokia drops MeeGO, you still have other companies, remember?), comparisons to other platforms and stuff, I have to say that it looks like a really nice device. Unlike the N900 though, I am skeptical about some things and positive about others (I couldn't find a thing on the N900 which put me off at all). So I will wait for the reviews, but I don't think a particularly gloomy disposition is necessary yet

Sorry for the long post.