I, for one, will keep playing, but then I've invested a lot already. BB in another thread says that the internals of IDL are the same but the interpolation is changed. From BB's posted picture and render time, I'm hoping I will still get a good feel for how the controls work, just that I will be allowed looser accuracy criteria and will get faster renders for the same result. So, I'd guess it depends on how patient you are, long-term vs. short-term.

Whichway

[Above comments based on zero real information, more or less.]