I have been seeing these new routes marked C-1 (for Circle 1 ?) for a few weeks now. Was waiting for some crisp annnouncement or press release, haven't noticed anything big yet, so posting.
Pretty colorful body, so much so that when I asked a few waiting passengers near Intel, they thought it was some private bus. Once you read the sign board carefully - 500 something - you may not have this confusion.
So will all the 500 routes get merged into this C-1? I haven't noticed any route merges (333P, 333E etc) on the Big10 routes yet, but this one may be different - 500D could simply be converted into C-1. Merging other 500 extensions may not happen sooon enough, though we know that converting major points on Outer Ring Road into bus exchange points (get off Circle route, get into a Big10, or a local route) will be the way to go.
Lets wait to see and hear more.