Its a hybrid but the advert seems to indicate electric, although it is a very nicely done VFX animation commercial. Check it out
?? Checked Toyota's website. There is no indication of electric propulsion, or hybrid anything. The Tesla Coils in the ad are for drama, and apparently mean nothing.
3.5 Litre, 6-Cylinder, DOHC, 24-Valve, Dual Variable Valve Timing with intelligence (VVT-i), Direct Ignition System (DIS), Acoustic Control Induction System (ACIS), Tier 2 Bin 5 Emissions Rating, Stainless Steel Exhaust System, ECO Mode, Sport Mode
I saw an Avalon yesterday and it had the Toyota Hybrid badge on the back. Here is a link to a road test: http://www.edmunds.com/toyota/avalon-hybrid/2013/road-test.html
So, I guess there's a particular variant which is hybrid. Not easy to find on Toyota's website. Peculiar it's not pushed very hard.
On the Avalon page, either scroll down, or click on Models and they list 4 non-hybrid and 3 hybrid models. Not that I want one, I was just curious since I saw one in the post office parking lot the other day.