Announcment here.  The Schock Prize is about as close to a "Nobel" as philosophy has, although as the title suggests, it tends to lean a bit more towards those with work related to logic than a pure philosophy prize would.  Still, past recipients include Quine, Rawls, Kripke, Nagel, Putnam, and Dummett, among others.  Kaplan is an obvious choice, and I would expect in the next decade to see some of Kit Fine, Tyler Burge, Timothy Williamson, Robert Stalnaker, Allan Gibbard, and/or Brian Skyrms recognized as well.