Yea I've been on the fence about trying that out, especially since it's missing some key features (reporting, the calculator). At least YNAB4 is supported til the end of 2016, gives them time to get the new one fixed up.
This is my plan as well. I'll continue to use classic thru it's end-of-life support cycle and then revisit nYNAB and see if they've managed to at least hit feature parity.