Yup, Wesley appeared in both the final book of the original Voyager relaunch, The Enemy of My Enemy, as well as in the third Cold Equations novel The Body Electric. In A Time for War, A Time for Peace it is explained why Wesley was back in a starfleet uniform. The Traveler and Wesley appeared together in A Time to Be Born.
I liked how apparently they decided to use Will Wheaton the actor as the basis for adult Wesley. A lot snarkier and cooler person.
I'm assuming Will-Q gave him a generous make over when he aged him. This just reminds me how creepy Geordie was in his reaction to adult Will.