I believe the MSRP is ~8,800. www.advrider.com has a bunch of info on it. Looks like the production version will be more "DS" like than the "hard enduro" it claims to be (i.e. "baja" setup). Not a bad bike, but different target audience... Personally I was hoping for something more harcore, like a modernized SXC. Maintenance should be similar to an LC4 (~2-3k mile oil changes), so yes, engine maintenance should be much reduced from the smaller enduro bikes.
All good bikes... Something to consider if you're going to dual sport it is a Husky. They're coming all tricked out as an ass-kick'n "dual" enduro bike out of the box this year (all 4s enduro models). Having said that, I was on the fence as well & picked the 450exc & dual sported it (Enduro Engineering has some simple & cheap solutions to do this). No regrets...