How is SWSD different from WHD?

How is SolarWinds Service Desk different from Web Help Desk?

Can SolarWinds provide a comparison matrix between the two offerings?

Is there potential to migrate from WHD to SWSD for those who are interested?  Or will SWSD have to be a whole new setup?

I don't know about my colleagues or if I've been out of touch with the forum, but I did not see this coming nor do I recall any sort of product pre-sales announcement or preview information by SolarWinds, there was just some announcement like this one that SWSD was here.

I've cross posted this in the WHD forum as well to get some feedback from those currently using WHD like my organization.