https://www.avanza.se/placera/pressm...adowlands.html
Every Level Is Meaningful: Shadowlands will introduce a new leveling system, meant to provide a meaningful sense of advancement with every level achieved. Current max-level characters will begin Shadowlands at level 50 and work toward the new level cap of 60.
(credits to Crysis for linking the article first)
Edit: Level squish IS CONFIRMED - https://worldofwarcraft.com/en-us/ne...hadowlands-now. Read on from Shadowlands: Expansion Features