Here we go again...
I'll jump in.
I think it's really likely that we will see some new liter-sized twin in the near future. I think it's likely because the SV1000 is ripe for a redesign, and the current 1k has obviously been crutched for emissions to the extent that it is in an "odd" state of tune. Whether that will be seen in a Strom-style bike will be interesting.
I can see them going to a single 800, but that would be a little disappointing. The Wee is a great little commuter, and the Vee is a torque monster. The 800 might be the best of both, or more likely a boring compromise of both.