It's kinda sad but the one thing that would excite me the most would be Apple making 32GB the base storage capacity.
Unfortunately, that's not going to happen.
16GB is insufficient in this day and age, especially if they're going to try advertising 4K recording and whatnot.
Actually I think 16 GB is fine for a lot of people, as a base model that is. What's more annoying is Apple's current low end models only have 8 GB! You can't even pay more to get a 16 or 32 GB 5c.
I hope they don't do something equally lame for the 5s. It seems the rumour mill is saying that September will bring the 6s and 6s plus, and keep the 5s around for the 4" model. Even having a 16 GB as the cheap 5s model would be far better than crippling it with only 8 GB.
BTW, I haven't decided yet if I'm going to upgrade from my 64 GB iPhone 5s. Although I do like the bigger screen of the 6/6s for two-handed use, I prefer the 5s for one-handed use. Also, the phone is still peppy, and has a decent camera with true burst mode. I may get a 6s, but who knows, maybe I'll wait until the iPhone 7 before upgrading.
However, I will upgrade my wife's iPhone 5 16 GB to a 64 GB iPhone 6s. 16 GB is OK for her, but not ideal since she takes a bazillion pictures and some videos of the kids. She could do with a camera upgrade too. Furthermore, she's been asking about getting an iPad mini, but perhaps if she gets an iPhone 6s, she won't need the mini anymore.
If I keep the 5s and she gets the 6s, that will be first time in our history that she would have a more advanced phone than me.