It's not really important since the 4S is obsolete and you'll be upgrading in a few weeks anyway.
Says the guy who yesterday posted...
I'm sticking with my 4S for at least another year. I love it. The size is perfect IMO, I love the build quality and based on all the rumours there's nothing to make me want to upgrade.
That said, I'm glad the majority on MR will be upgrading because that's good for Apple.
That doesn't sound like an "obsolete" phone to me.
The definition of "obsolete" is "no longer in use or no longer useful".
That certainly is not the case with the 4S.
I too have a iPhone 4S (64GB) and it is still a more than capable smartphone. Reports from those who are running the iOS 7 dev beta says it runs very well on the 4S. The 4S has an excellent camera. Good speed. A great display. With 64GB I have more than enough storage. It has the 30pin connector that is compatible with a massive amount of accessories. Like you said, the size is great. I wouldn't mind having LTE, but the speeds I get with the 4S have been decent for the most part, plus LTE wasn't very widespread when the 5 came out.
I've owned the 3G, 3GS, 4 and now 4S. I upgraded every year because the features in the newer phone were enough to make me want to upgrade. That wasn't the case with the iPhone 5 with its slightly better camera, slightly faster speed, slightly bigger screen, slightly better video features, better facetime camera (don't care) etc... plus the negatives, new connector means I need to buy adapters or get rid of some 30pin devices I own plus other tradeoffs.
The features of the iPhone 5S
might be enough to make me want to upgrade when they are revealed next week (especially since I am eligible to upgrade) but that depends on the features. I may just wait another year until the rumored new design / larger sized iPhone comes out. I just hope the battery performance on the 4S doesn't deteriorate too badly in my 3rd year with it as my Applecare+ will expire in November.
Anyways, if I decide to stick with my 4S, having iOS 7 will be kind of like getting a new phone which will help make the wait for next years model a little easier.