I don't think PP will be anti-VIA anymore than I think JT was pro-VIA. After all, JT has been in power a decade and all he has managed to do is buy some new trains which isn't much of an accomplishment. He's talked a good storm about HFR/HSR but like every other PM in the last half century, he hasn't done a damn thing.
As evandyk noted, PP is making huge inroads into the entire GTA/Ottawa/London which are all predominately Liberal strongholds. It will definitely come up in the election campaign including transit and he will make some solid promises about transportation if he wants to gain all those nice juicy urban seats. Corridor updates will also be more likely due to, wait for it, Danielle Smith. She has presented a very bold proposal for passenger rail expansion throughout the province and HSR between Calgary and Edmonton and she will be looking to her good buddy PP for some hardcore federal cash. PP will need to oblige his old ally and with that will automatically come funds for The Corridor. Politically it would be impossible for him to help one and not the other.