There will be a second edition of Dan Merseys Lion Rampant rules published by Osprey, its due for release in 2022 july 19... just 8 month left...
Not sure if this is the official cover, but I think so. The book will be a hardback of 160 pages, havent seen it yet.
As I understand Dan there will be added content for the dark age period... VIKINGS etc... as well as the medieval period. In addition, you'll find extra scenarios and expanded campaign ideas, greater details for terrain, a chapter of optional rules, extra unit upgrades, and plenty of other new stuff.
The core rules have a few updates but it's still LR as you know it. Same goes for troop types - any retinue you raised for the blue book will still be usable.
Now its just to start waitning...