That depends on what you mean precisely by "support". It can compile programs designed for wxWidgets 2.8.0, and could from the day wxWidgets 2.8.0 was released. Code::Blocks itself is not yet meant to be built with wxWidgets 2.8.0, but that doesn't affect your experience as the end user in the slightest. The current wxWidgets wizard within Code::Blocks won't create wxWidgets 2.8.0 projects, but the projects it creates can be converted to wxWidgets 2.8.0 with a couple of simple changes in the Build options.
-TDragon