The new Pokémon that I look forward to see the most are the evos of older Pokémon; I'm still waiting for this gen's!
Actually; it's pretty hard for this gen to introduce new evos/pre-evos. Why? Because Isshu is far away from other regions; just look at the new route numbering system... (and there is a pretty good chance for old Pokémon to not make it on this Dex).
I'm still hoping for new evos; some Pokémon that could use it would be Farfetch'd, Seaking, Mr. Mime and Jynx (to be on par with the others), Lapras, Ledian, Ariados, Lanturn, Xatu, Sudowoodo, Girafarig, Dunsparce , Qwilfish, Magcargo, Corsola, Delibird, Masquerain, Delcatty, Sableye, Mawile, Manectric, Plusle, Minun, Volbeat, Illumise, Torkoal, Spinda, Zangoose, Seviper, Lunatone, Solrock, Crawdaunt, Castform, Kecleon, Banette, Tropius, Chimecho, Relicanth, Luvdisc, Kricketune, Wormadam, Mothim, an alternate evo for male Combee, Gastrodon, Chatot, and Carnivine.
P.S. I don't know why the heck they gave Chimecho a pre-evo when he really needs an evo. An EVO! Also Gastrodon's cool.