Will definitely be looking at it with hope. Still have a series 0 because series 2 wasn't a big enough improvement -- the WatchOS update was fine on its own.
wOS3 solved all my issues with the AW. wOS4 will help S1 and 2 don't do anything more for me other than futureproof.
If I had it to do over, I'd have got an S1 instead of an S2. The GPS isn't a fully functional system without the phone and seems to be pretty much limited to tracking your run.
I'm comfortable with my AWs and S2 so it will take a serious upgrade for me to consider an S3; something possible with only new hardware. Except that I like the unique-to-Nike watch face, my next Watch could an S1.
I'll be getting a Nike+ and a Series 1 at the next $70 off sale.
There's money put aside for a Series 3, if it's different enough from predecessors. Otherwise, like my iPhones, I don't mind skipping a model year, which is what I usually do.
I'm waiting to see what Apple comes up with. I'm still using my Series 0. If the Series 3 wows me then I'll purchase. If not, then I'll try to find the Series 2 for a good discount. I prefer the black stainless steel so I'm looking for whatever will give the most bang for my buck.