reFX have released Nexus 4. I would paste the What's New stuff, but it's almost nothing. The Librarian, Arpeggiator, Effects and Layers page all have a few enhancements, but no radical changes or new features. There's 260 new presets. Upgrade cost - $99, the same as the upgrade from N2 to N3, which was almost an entirely new product.
With VPS Avenger having dropped Codemeter, those who need oven-ready dance-centric stuff for their work would be much better off backing that horse and getting an excellent synth thrown in imo.
If you want to feast on all the exciting Nexus changes nonetheless, here they are - https://refx.com/nexus/#editions