Our flight from YYZ to CUN last week turned out to be on Rouge, as Rouge has been growing ints A319 fleet (with transfers from AC mainline). There was no difference in check-in or boarding process, except that the priority boarding call for "business class passengers" was a little bit pointless. Once boarded, though, the view was certainly different: The seats were slimline ones (enabling more pax with less weight), but comfort of the seat itself was quite decent. I had selected 3E/3F for our flight so we got to enjoy the "Rouge Plus"-level comfort, with (I think) a 35" pitch; I didn't feel sufficiently motivated to check out the comfort in the back, and see whether these seats make 31" tolerable. Some other parts of the interior (such as the wall between the pax and the front galley show clear weight-saving initiatives as well. Overheads are the same -- and I mean the same, looking a bit beat up from years of use. The IFE is iDevice only or laptop -- but I wasn't able to get the laptop option to work. I connected to the wireless network, but there was no obvious URL to go to (and no instructions), and typing in an arbitrary URL didn't redirect to anywhere useful. Will try this again on the return flight. Cafe on Board was Rouge-branded but as far as I could tell it's exactly the same as the one on AC mainline flights. The crew was new, and wearing the designed-to-be-hip Rouge uniforms. They also tried to be chipper and cracked a few jokes (fortunately not too many) and ran a small guessing contest for all the pax.