I'm all good with the phone being slightly thicker AS LONG AS the accessories for the 6 Plus are still compatible. I just bought a mophie juice pack air for the iPhone 6 Plus last week when mophie was running a 20% + free shipping promo. I did this assuming that (since it's an "S" upgrade) it would be compatible with the 6S Plus.
With the 3GS, I got the juice pack air for the 3G and it worked just fine.
With the 4S, I got the juice pack air for the 4 and it worked just fine.
With the 5S, I got the juice pack air for the 5 and it worked just fine.
I am hoping to continue this trend for the 6S Plus....
With the 3GS, I got the juice pack air for the 3G and it worked just fine.
With the 4S, I got the juice pack air for the 4 and it worked just fine.
With the 5S, I got the juice pack air for the 5 and it worked just fine.
I am hoping to continue this trend for the 6S Plus....