This is more than just a skin change. It is a migration to a more robust forum package that allows MUCH more customization and spam protection.
The spam issue on the old site was way out of control and I have hopes that this change will allow us to weed out the majority of spam out there.
vbulletin is probably the most widely used forum package out there at the moment. Add on a mobile skin that we have for this forum and I think you will like this package when you get a little more used to it.