Underground portion was changed to below-grade many years ago. On the planning maps they post online, they still show a proper transitway between Ridgeway and Hurontario with stations at Ridgeway, Winston Churchill, Erin Mills, Creditview, Square One, and Hurontario. So I'm guessing the Rathburn busway is just temporary.
http://www6.mississauga.ca/onlinemaps/planbldg/missplan/churmead.pdf
http://www6.mississauga.ca/onlinemaps/planbldg/missplan/centerin.pdf
http://www6.mississauga.ca/onlinemaps/planbldg/missplan/credview.pdf
http://www6.mississauga.ca/onlinemaps/planbldg/missplan/citycent.pdf
Three different buses:
Orion 7 Hybrid, Orion 7 BRT, tricked-out New Flyer artic
Based on glance of the pics I've seen, the hybrid buses have the same lower seating layout as the TTC buses but different upper seating layout at the back. The BRT buses use same or similar seating layout the the current MT Orion uses, but also different layout at the back.
And of course the artics have different layout altogether, but the same or close to the same as to the current artics.
I doubt that all artics will be blue. Other than the 110, all the routes that need artics are local. Even now they have way too many blue artics...