We're not planning on adding poly routes, as it's too much work for us to add on top of what we already have to complete, but we'd like to explore some kind of DLC or mini-story at some stage giving MC the option to romance both Alisa and Zane :)
As much as I hated Alisa when it seemed she and Damon would get together if you didn't go Damon's route, I would be all over an Alisa/Zane DLC. I'm not even bi and would still play it. That would be a blast!