It'll be using some kind of "rain repellent" coating I expect.
Wipers are required by Part 121 type ops, but not for business aircraft. So, bye-bye wipers. They've been removed from Challenger 850s (=CRJ with business layout) as well.
As to why .... well, they add weight and complexity and I guess don't look as pretty to the people paying for the shiny new aircraft. I'm told wipers are a lot better if you want to see out the windows at taxi speeds, though ....