LTE in the UK would actually be perfectly timed. Bear in mind that most people will have their iPhone on a two year contract and LTE is due to roll out next year. This way if you buy into an iPhone 5 in September 2012 (and live in an area that's in the first wave of the rollout) you'll get a speed boost mid-contract rather than having to wait a year.
As for the rest you overlooked the biggest change - design. Quite frankly it's hard to see what Apple can do other than the items you listed. The camera is still one of the better ones out there, they're improving the screen (and not just size but quality too) and we're still a year away from the next big bump which will be the Cortex A15 and PowerVR series 6 SOC. Plus, of course, iOS 6 on top which brings a few big changes (maps being the obvious one including turn-by-turn) and several smaller but very useful changes (do not disturb is being underrated by the geek community IMO).
Without wishing to be rude, what do people expect? Unless Apple pull a fast one it's still too early for the big SOC bump we know is going to come with A15, the screen quality, camera quality and operating system are all top notch, battery life is likely to improve (A5 at 32nm seems the sensible guess and that would save a fair bit of juice, plus improved cellular radios)... what else would you realistically expect to make it in that would be a genuine game changer rather than gimmick? One thing I could maybe see them doing (and I wouldn't put money on this) is maybe dropping the price or increasing memory capacity but I don't think they really need to.
I guess the LTE makes sense, obviously I'm thinking about my needs, I live in the middle of Lincolnshire, we get no edge and certainly no 3G here!
I do agree, ultimately there isn't much more they can do, it's just difficult to keep telling my friends and colleagues that the iPhone is the best... when so many other phones have these wow features (sure, most people probably never use them) but they still look great on paper!
Fully agree with the camera, main reason I stick with the iPhone, I honestly think it is the best camera out there, I didn't like the photos from my S3 much.
For me I'd like to see a capacitive button, I know many people don't want that but I personally do! I'd like to have gestures on the iPhone, again some people don't want that...I had it Jailbroken once and it worked fantastically.
I've been using iOS 6 since the first beta and it's great, some real good improvements but like I said above, it's becoming very difficult to keep my eyes focused on the iPhone.
Apple is very good at gimmicks...so maybe it's time they started doing some with the iPhone....Glowing Apple logo? ;-)