We don't know what will happen with the twin. It's in their hands, and as Ducati Scotty says, they don't seem to be talking about it anymore.
I'd say it would be a likely thing for them to do, but I don't know.
As for 45hp, and lightweight and nimble, I think that is already coming to fruition with the Iron Barrel single cylinder 500/535. The UCE single also might be possible to reach that too, if there is demand for it.
If they are going to make a twin, at least they should make it have more power than we can wring out of their singles.