Shimano users may think of 11 speed as fairly new, but I switched all three of my Campy bikes over to 11 speed in 2009. No regrets at all. Unless you're a beginner, 11 speed is the way to go. 12 speed is here and the other brands will probably not wait 4 years to follow suit. Right now I'd gain nothing but an 11T cog I don't need, so I've got no incentive to switch to 12.

About wheels suffering from 11 speed. I guess is depends on the brand. Campy hubs fit 9 through 12 speeds. No hub width changes have been made in a long time. Campy offers a lot of rear wheels with G3 spoking where the rear wheel has groups of 3 spokes - two for the drive side and one for the nondrive side. Seems to work well.