I definitely am. I didn't want to upgrade to the 5S because there wasn't much different so I decided to wait for the 6 to see what new features they can come up with. I'm so glad I'm waiting.
I'll probably just sit back, wait and see what the iPhone 6 would offer... But there is a big possibility that I may be upgrading. The upgrade from 4S to 5S just doesn't seem to be necessary to me.