Fast Zorro IV is also supported.
Erm. Fast-Zorro II, as it uses the same connector and same signals as Zorro II.
Zorro IV uses a custom connector and is not documentated at all, even the pinout of the VG96 connector is unknown. So support for Zorro IV is not planned, as it would need a) an adaptor (VG96 to Zorro II edge connector), and b) documentation for Zorro IV, and I doubt that ElBugs would offer me that for free :-)
From the technical point of view it would be possible to program the DENEB FPGA for Zorro IV support with a suitable connector adaptor to fit the VG96 connector.
Michael