TerraDave
5ever, or until 2024
I think the broad goals have been covered. (And to cut right to the chase, if you have the two other books, I really don't think its worth it).
Some details: Numbers have been adjusted, though not as much as you might think. Types have been played with, with new subtypes and pretty much anything humanoid can be non-evil, so some like the gnoll have been turned into monstrosities. Short rest recharges gone (or almost totally gone), including in playable races. Attacks as a magic weapon have been turned into force damage. Spells massively trimmed back for monster and NPC spellcasters. So the high level druid, for example, is missing many iconic druid spells.
Overall streamlining, and presumably aligning with 5.50. But there is every reason to believe you can keeping using the older books, eve with 5.50.
Some details: Numbers have been adjusted, though not as much as you might think. Types have been played with, with new subtypes and pretty much anything humanoid can be non-evil, so some like the gnoll have been turned into monstrosities. Short rest recharges gone (or almost totally gone), including in playable races. Attacks as a magic weapon have been turned into force damage. Spells massively trimmed back for monster and NPC spellcasters. So the high level druid, for example, is missing many iconic druid spells.
Overall streamlining, and presumably aligning with 5.50. But there is every reason to believe you can keeping using the older books, eve with 5.50.