Same here. 8.0.something. I didn't really look. I hadn't set a phone up as new in a while so I figured this was as good a time to shake out any possible accumulated cobwebs. Shouldn't be any but by starting fresh I won't wonder "what if" should I have any issues.
To restore from backup instead, should be easy enough to set up as new, update iOS, then wipe phone and setup up again but from the iCloud or iTunes backup.
See, I kinda like this setup you mention.
-Turn on the new iPhone 6
-set up as new phone
-update to latest iOS 8.1
-erase phone completely
-turn it back on and restore from your old iPhone's backup which was iOS 8.1
Seems the cleanest way, but I'm not sure if it's overkill. I may do it still
UPDATE:
Also for prepping my upgrade tonight. I just:
- reset the network setting on my old iPhone 4s running iOS 8.1
- I then held down the home button and power button until the apple logo appeared, guess this flushes RAM that buggy settings and apps may have
- I then did a itunes backup of the 4s running iOS 8.1
- now I'll use this backup for restore on my new iPhone 6 tonight after I flush that phone and install iOS 8.1 on it
*maybe more overkill, but hoping for a bug free transition of phones