Let's be real....you are going to be a insanely jealous if you can't afford the iPhone 5. But jealousy is normal because you are human. Just don't let it consume you.
If the pattern is the indication, the iPhone 5 is going to be very different externally, hopefully bigger, screen wise. Software wise, iOS 6 of course will bring new features, but the majority if not all will be available for your 4S.
So yes, the iPhone 5 will be different and it will make you want to upgrade, but be a responsible adult about the situation and make an informed decision or be an irresponsible adult and just buy it cause you want it. I do the latter every year.
As far as the iPhone looking stone age, I think there is a good chance that that will be be the perception if the iPhone 5 is an external upgrade. For the past two years, we have had this front and back glass design so to have a fresh new look will definitely make the phone kind of old looking, but again, software wise, the 4S will probably be pretty much identical. Internally, the 5 will have upgraded hardware. That's no surprise.
Will iOS 6 work on the 4s?
If so I am happy I got 4s as waiting 5 to 6 months is not worth for a phone with a slightly larger screen, different look (the reason I like the 4s is its look), and 4g lts which is not available from my provider as I live in Australia and there is NO WAY at all i will join with Telstra in my right mind.
Will I be jealous in anyway sure maybe a bit but will I kick myself no not at all