I've had the new Autavia on my wrist for the past two weeks now and would say it is no chunkier overall than my 11630.
I prefer the bezel style and thickness on the originals if I'm honest as it's just less in your face. I'm still enjoying the new Autavia, however I get more of a buzz wearing my 11640mh.
If you're seriously thinking of going the new Autavia root, consider getting your name on the list for the limited edition Jack Heuer Autavia, which celebrates his 85th Birthday. It's not a reverse panda, but I personally think it helps it look less chunky, and although does away with the glass back, you get a Jack Heuer signed case back instead. The best part is it's the same price as the standard Autavia.
I can also try and get some comparison pictures, although sure Jeff's will be far better.