Yes that is what happened on my desktop. On my old laptop I switched it to the experimental setting for current branch and it went from 26200.8037 to 26300.8758 using WU.
After installing 8697 WU will not pick up on 8758 so I'm redownloading 8758 from UUP Dump. Maybe they were just having a bad day when I did it the first time.
The official iso is 8697 so I'm building the UUP Dump iso right now which I will install from once completed.
Edit: The UUP Dump iso is flawed so I installed 8697.