I wonder if this is the final/"complete" wand we're sticking with through Season 4.
We've got a new wand with a new season twice now, so it's a question of if they'll stick with the trend or know that we're expecting it and do something different.
I think the possibility of Eclipsa stealing the Wand "back" would be an interesting direction to take the show, leaving Star unable to do magic without Dipping Down. It matches up with the continuing themes of Star needing to stop relying on magic to face her problems, and Star being forced into "fly or die" harder but faster training as Glossaryck knew was the most effective for her. Plus with Star stronger than ever it gives them a way to put her back in some real danger, and there's the possibility of Eclipsa entrusting another character with the Wand.
No matter what happens I sincerely hope they go completely over the top in the finale and have the final victory secured by Star and Marco both holding hands and the Wand between them, transforming it into its true final form and blasting away the final boss with the power of love