If something like NatAmi isn't a "next generation" Amiga project, what would it take to make it one?
A lot of bug-fixing, hardware descriptors, drivers, and tweak the VHDL of the chipset to make it possible to run as an ASIC rather than an FPGA. Beyond that, nothing much. (Note: It will take a lot to get up to the volume of customers that will make the NatAmi cost-effective, although DARPA has a project that may make small quantities of ASICs cheaper.)