Nope.
Ah thats right. He was in it, just only playable in Mario World and New Mario Bros styles. Yoshi eggs were replaced by a different powerup in SMB1 and 3.
Really hoping for an overworld creator as well. That and slopes is hat people want most.
An overworld is what I'd want to see to get me interested. It's a much bigger ask than slopes but not completely unreasonable, and has been a staple in the series since SMB3. It could really tie the experience all together.