The LPDDR5 standard was supposed to hit the markets in 2020, but it looks like Samsung rushed the mass production schedule in order to consolidate its premium handheld offering and promote the adoption of 5G and AI tech for future smartphones. By the end of this month, Samsung also plans to begin mass production for 12 GB LPDDR5 chips with eight 12 Gb modules.
https://www.notebookcheck.net/Samsung-starts-producing-12-Gb-LPDDR5-memory-for-premium-handhelds.427821.0.html