Glad I got the SM2. The new 3 looks like an improvement on the electronics but the integral band is not a good move. The SW2 allows for traditional bands which I did since I didn't like Sony's rubber band. Arm would sweat under it all the time. I have a tough black metal titanium band now which I prefer. The SM3 says it has a run time of 2 days with 4 on standby. Since the watch is never on standby I don't understand. Mine had 4 pages of apps running constantly with updates every 5 minutes and I get 2 days now.
If Sony wanted to improve the Smart Watch they need to make it water proof and be able to charge it wirelessly. ( No micro USB charging port ) That's my suggestion.
Waiting for reviews, there must be something about the 3 that makes it a buy.