Just went and grabbed it, very curious to see if it does actually improve battery life that much...
Please do report back, I had Push Notifications turned on the other day (for use with Appigo's Todo Lite). My testing showed that with same kinda voice/internet/sms usage :
Without Push: Battery 100% -> 88%
With Push: Battery 100% -> 36%
OUCH quite a difference, so must test Push again to see if I get the same results a 2nd time. Using JB 8GB 3G on 3.0.1.