From www.wdwinfo.com

Disney World buses getting new paint colors?
Jan 30, 2013

It looks like the Disney World buses may be getting a makeover. An Instagram user has posted a photo of one of the newly-painted buses. This new design is much more simple than the current white buses with the word "Disney" splashed across the side in black. In recent years, the bus drivers received new costumes, and the silver and red retro-looking buses will match nicely with them.

Check out the new colors here.