Alder Lake will adopt DDR 5, that's slated for the end of this year. We'll see what happens but as of right now, it doesn't seem too far off. Fingers crossed Intel's 10nm pans out and is a lot more power efficient and water cooling isn't necessary for high end skus for those that want to remain on air.
The speeds DDR 5 is said to capable of, be very interesting to see how fast and how much of an impact it has. Probably wont see 7000MHz+ for awhile but that's just my guess, it could be middle of next year or sooner. Optimistically having my fingers crossed 🙂
Rollout of covid vaccinations around the world can only mean fabs gear up to full production sooner.