MiSTer is about 110K , this can go up to 218K. Probably this new FPGA is something like BGA package, since it has over 500 I/O pins. Also not available this year: "AMD Spartan UltraScale+ samples and evaluation kits are expected to be available for sampling and evaluation in the first half of 2025."
This isn't "a" new FPGA, there'll be like 50+ (or even hundreds of) SKUs, many will be various BGA/chip scale packages (with different numbers of pins available) but not necessarily all of them. The Spartan line, being the lowest level of Xilinx's FPGAs, have traditionally had a few versions in TQFP packages. I wouldn't be incredibly surprised if they did with this new version (although it's probably less and less likely with each generation).
There weren't any TQFP packages in 7-series either, and I don't expect that to change for US+. Even Spartan-6 only had that package for their smallest parts (XC6SLX4/LX9).
