I'm looking forward to how well it compares all-up to iP4...
If it does better in most detailed/impartial reviews, then I see few huge reasons not to get it.*

Everything I've read suggests iP5's biggest improvements will be in software.
And that hardware (compared to previous years) will be only marginally improved.
Many pundits are saying the big hardware changes are coming approx. May 2012.
But at the same time....
The software improvements will apparently be among the best we've seen for iOS.

So all-up by the time we get to iP5, there's a pretty strong probability that:

1) It'll be better hardware-wise, all-up
(There'll of course be some areas that are weaker, but all-up)
2) It'll be somewhere between worse & slightly better software-wise, all-up
(That's not factoring-in Apple's online services/apps/music etc.)

Purely guesstimations of course, as we've few "facts" about iP5, particularly WRT hardware.
But assuming it's not hugely better in those two areas....
Then that won't be enough for me to buy an iP5, instead of the N9.

I'll probably get iP5's successor next year though, & maybe a new iTouch in the interim.
But only after I've bought a new Android handset, & my 1st WP handset.**
iOS devices are mostly what I've owned over the years...

*apart from some of the "minor" issues we've discussed
**I doubt I'll get a Nokia WP handset.