The Notch Filter effect has not been ported for this release, though it remains active in our feature database. Currently, most of the same functionality can be accomplished using either the FFT filter or the Parametric EQ with tight Q settings.
You may also want to try out the new DeHummer Effect (found in Effects > Noise Reduction / Restoration). It has the ability to notch out one or more frequencies similar to how the old Notch Filter could. If you try it, please let us know if there are any settings that work particularly well for you.
Ok, yeah I use FFT for somethings and prefer Notch for others. Feels pretty good so far.