The developers are going to update the skill tree and more.
Recently, the YouTube channel Raxxanterax presented an interview with the developers of Diablo 4, during which some plans were revealed.
Developers are trying to combat the problem of RMT (with users who provide in-game services to others / sell items for real money).
One solution may be a special Solo Self Found game mode; it will appear in the future, but there is no exact release date yet.
New endgame content is being prepared - the ranked "Tower" mode. Although it may resemble the "great portals" of Diablo 3, it should still offer something new.
The authors of Diablo 4 are listening to feedback about the skill tree (players believe that they provide little choice) - changes are being prepared for the trees of all classes, but they will not appear in the near future.