I'm due for an upgrade from my 6+ in May and will wait for what this offers.
I use the 6+ mostly for surfing the web pages as opposed to phone calling so the larger size is a must. But what will sell me is if the resolution of the OLED screen is much higher than the 6+. The reason is I'm getting into VR video and have the goggles for 360° as well as 3D SBS viewing displayed on the iphone apps. Given that I am now shooting 360 video and hopefully this summer will be upgrading to 360° 3D the need for very high resolution display is important to me. In VR, HD screens at 1080p x 1920 just doesn't cut it with these goggles. I'm not sure a 4K will but I want to test first and see.
Wireless magnetic charging is interesting but not really necessary. In fact if my Apple watch had the same plugin connector as my iphone I would favor that although I understand that negates water proofing. When I get in the water I switch to my Tissot T Touch watch which has an easy to use timer and analog compass which for diving is important. The Apple watch use is more important to me for answering phone calls, Dick Tracy style as opposed to water proof feature. I understand Apple figured out how to make the mic and speaker work on the latest watch and still claim it is water proof. I'm not convinced that will last. I may be wrong on that. Note that the wireless charging cable is more expensive and bulkier to haul around. So there are pros and cons to both methods.
The wrap around screen to me is just a gimmick and has no real functionality. I agree that bigger battery- longer life is a good thing too. I get about 3-4 days on my charging of the 6+ and about 42 hours on my watch. That usually works nicely to put the watch on a magnetic charging stand every other night while I'm sleeping. That stand doubles to charge 3 iphones too or another watch by adding a second magnetic charge cable.
One thing is certain, the iphone infrastructure is addictive. The iphone is the most stable phone I have ever used, compared to my older Android phones.
As far as the anniversary revolutionary offering- I can't imagine what they could offer other than a hearing aid style miniature phone and we already have that with the air pods but the biggest innovation for a new way to stay connected is the Apple watch. I do text messages, make phone calls, control my media audio books and music, read email, get alerts, weather updates, even stock trades all from the watch. Only time I drag out the iphone from the pocket is when I need a larger screen to do those things. To me the iphone is mostly just the central communications server on my body. The Apple watch is my work station throughout the day.