Just noticed something funny today. I turned on autostart actvity to see what it would do. After walking for about 5 minutes to do some shopping a walking activity was indeed started.
It started at 5 minutes but at 0km, What i did not expect was this: after syncing with Connect later it had the entire route plotted out except for the first maybe 30 meters or so!
Apparently the watch is silently turning on GPS as soon as it detects you're walking.
Something to be aware of in terms of battery life, but it's actually a good thing, However it does not record the distance elapsed in those first 5 minutes, screwing up statistics.
I guess i should consider the distance not being recorded a bug?