Hey Matt, It was a morning release. As far as I know sites that where in any plans before todays update will run under a "legacy" sort of program and will keep it's features. Webflow has not mention anything yet about how long these plans will run under legacy.
On my side I think this is a shitty update because the more cms items the more bandwidth you use. WTF, 10 and 50 GB bandwidth any hosting out there can do more than that. It's gonna be hard to explain new customers that pricing increase.