At the end of 2026, the Advanced Performance Extensions, APX, will be in shipped processors by Intel. In 2027 by AMD.

Will FASM 1 get the extensions or only FASM 2?

Does this first APX include the upgrade to 32 registers?

Yes, there are no multiple versions of APX. So, the 32 registers are available in the first release. The normal 1-byte prefix for 64-bit assembly code will get a 2-byte prefix for APX. That will increase the code size, however, the new 3 operand instructions will compact the code.
For instance when you have a value in RCX and you want to bitshift right 4 times the value and put it in R18, you can do in APX:
SHR R18, RCX, 4
It will not touch the RCX register.
Intel has a simulator for APX.

Are there any initiatives to motivate big G. Thomasz to think about APX?

APX is basically RISC-V/ARM for x86_64.

Funny. Maybe we'll get a RISC-V decoder front-end for AMD and INTEL µarchitectures (probably server/mobile at first)

Yep, maybe the time fasm pre-processor/CALM languages will get a RISC-V port is getting closer?