Just as with the Campagnolo 11-speed outer chainrings, you should upgrade to the Campagnolo 11-speed inner chainring when you make the shift to 11 (speed), or when you wear out the inner ring on your existing 11-speed crankset.
As with the outer rings, it is not a 10-speed ring re-labeled, 11-speed is it's own thing. The teeth are 0.4mm narrower. 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 change 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 inner chainring is available in two sizes: 39 teeth in 135mm bolt circle diameter (standard) and 34 teeth in 110bcd (compact).