It could still be debuted by Cabernet. I don't see Mijumaru evolving as long as she has Futachimaru and uses it somewhat regularly. Pokabu only evolved after Bel's Chaobu evolved into Enbuoh. I think after Jalorda has debuted, Tsutarja might evolve, but I rather see her stay as she is. I don't see Satoshi having the same fully evolved starter as a rival in BW because all of the rivals that have a starter are fairly identified to it unlike Shinji in DP who was more associated with other species than Dodaitose.
I'd also like Dent to catch the Riolu we've seen on the posters. Since Iris' latest capture was spoiled there and in the opening, maybe Dent's will be as well.
Burgundy is a joke character on top of that, she isn't Ash's rival.