It seems to me that a Pathfinder specific platform would be the most logical. There are already plenty of VTTs out there that are perfectly functional as system-agnostic, but I think having something that does one thing really well would be most helpful to the PF community.
I would love a VTT that would highlight the spaces a given character can move to on his turn, click on an enemy to automatically attack/apply damage, a leveling and creation wizard, tool-tipped rules, etc.. If I wanna play 5E or anything else, I have Roll20, which already has a massive community and I'm accustom to its layout... from Paizo, I want something that expressly caters to my preferred system.
At any rate... is this thing even still happening?
API scripts already allow all of those features you're asking for except for a character leveling/creation wizard. Though I don't doubt that's too far off for the way Roll20 does things. One thing they've figured out that no other VTT is doing, or doing well (oddly enough considering the success of video game modding) is to give the community tools to write and share their own scripts.