Yes. I don't know what "very soon" really means! The arrangement with Sky to offer NowTV to BT TV subscribers was implemented about a year later than originally planned, so I'm not holding my breath!
Maybe there is some sort of embargo on it coming to Roku. We know it's on Now TV stick a form of Roku. What I noticed today was that you can now get BT sport on a sky package which is a new thing.
Hopefully once those offers finish we can hope to see it on a native Roku app