I saw this announcement and thought it might be of interest.
JEDEC Publishes New DDR5 Standard:
JEDEC Publishes New DDR5 Standard for Advancing Next-Generation High Performance Computing Systems | JEDEC
If you need the specification you can download it here for $369:
DDR5 SDRAM | JEDEC
DDR5 memory spec is finally official but hold onto your DDR4 RAM modules | PC Gamer
Seems to say it will be at least another year before it will be available on Desktop PC.