In order to do a proper upgrade to 11, you need not only new Campagnolo Ergopower levers; you need an 11-speed cassette, 11-speed rear derailleur, an 11-speed chain, and 11-speed chainrings. Campagnolo makes 11-speed outer rings for those who want to upgrade their 10-speed cranks, or who need to replace a worn-out ring on their 11-speed cranks.
It is not a 10-speed ring re-labeled; 11-speed is it's own thing. For one, the teeth are 0.4mm narrower. There are also four separate ramp systems built into the ring, rather than the two upshift and two downshift zones apiece on their 10 rings. The beautiful finish is the result of a new anodization process that is much stronger and lasts four-times longer than the old finish.
These 11-speed rings will work with most current 10-speed Campagnolo cranks. The two exceptions are Centaur and Veloce cranks, where the spacing is different due to the fact that both cranks utilize narrower stamped chainrings. 11-speed rings are machined.
You might be tempted to stick with your current 10-speed rings to save a little cheddar. Campy can't guarantee that your shifting will work with the older 10-speed rings. The slight difference in the width of teeth could result in chain suck. And the law of chain suck is it happens when you need it least.
The Campagnolo 11-speed outer chainring is available in three sizes: 53 and 52 teeth in 135mm bolt circle diameter (standard) and 50 teeth in 110bcd (compact).
The actual weight of the 50 tooth chainring is 101g, the 52 tooth is 87g and the 53 tooth is 96g.