Hi!
Welcome Spectrum Next to new FPGA 8-bit computers! 
I'm are one of the ZX-Uno Team (
http://www.zxuno.com)... developers of another FPGA ZX-Spectrum open source/hardware computer clone. (We are delighted with the arrival of this new machine ;-))
If are interested... you can find some info in the link attached.... or searching for our group in Facebook.
I'm currently finishing my first game for ZX-Uno (basically a ZX-Spectrum 48 kb with
OUR NEW video graphic mode called "Radastan").
(I don't know if the Next have support for this new video mode).
Features of Video Mode Radastan are:128x*96 screen pixel...
without color clash.
Each pixel have single color of a 16 color palette (based on Ulaplus -
https://sites.google.com/site/ulaplus/home)
And we have, INT video raster, scroll.... and some other features.
I upload some snapshots...

Videos:
On Emulator (ZEsarUX):
On real Hardware:
[ Invalid YouTube link ]
Developed using Z88DK. (
https://www.z88dk.org/forum/)
;-)
PS (For a long time I did not enter this forum ... it's a pleasure to stop here again

)