I'm not a fan of the classic Sunn amps for guitar either, though I do like them for bass. Conrad's current guitar amp offerings sound great, with quite a few models being something I'd own myself if I had the money.
Fender bought Sunn originally in the mid 80's because they needed production space. As part of their buyout deal with CBS, the new Fender owners did not have any buildings to build their guitars and amps. They decided to build the guitars in Japan and bought Sunn to get access to the building and production equipment and workforce to build amps. As their fortunes increased, they started up guitar production in the US again and eventually moved the amp manufacture also and closed the old Sunn building in Oregon. They kept the Sunn name and used it for PA stuff and then eventually some amps, but nothing like the old classic Sunns.
Knowing Conrad as I do, I doubt if he'd be into starting up Sunn again, even if he could get the rights to the name. He's older now, and he's run two large companies already, and I think he's enjoying his small niche he has now a lot more. He's learned a lot over the years about making good sounding guitar amps and you can bet that if he did do Sunn again, the guitar amps at least would sound nothing like the old ones did. But who knows, stranger things have happened. Anyway, I wouldn't hold your breath waiting for new Sunn amps from Conrad. It sounds like Fender is happy to just sit on the name for now also. But we still have our classic Sunns to enjoy so its all good!
Greg