I'm positive that Ike will remain as a very strong character.
On sonic, while he can't do an instantaneous special/jump cancel on homing attack hit, he can still act early from it due to IASA, with added maneuverability after the hit he can followup with a variety of moves both in the air or the ground depending on the situation or character being hit.
SideB instant spinroll may be gone, but downB is still there, with tweaks to act a little more similarly to how the 2.1 sideB spinroll did.
At the same time, players will notice when they have this version in hands, that many of sonic's normals received several tweaks to work, combo or connect better.
In other words, Sonic can still spin a lot and bait and punish like how he does in 2.1 (with a different move though), however he won't be completely safe on shield. He will, with the received buffs, be allowed to also play a style which stays closer the opponent, being able to successfully outspace many characters and combo better.
The course of action will change depending on matchup, you will be able to better fight Mario once you get through his fireballs for example and still be able to bait and punish ganon as you could before.
The new sideB, Spin Maneuvers can go through the well know spin hop, and then start the multi hitting somersault once you reach the ground, you can also use somersault instantly, by pressing B, the skid attack is activated, it's a low angle attack that can kill in a similar percentage range of other sonic attacks.
Both the spin hop and somersault are jump cancellable and the somersault and skid attack are ledge cancellable.
This way, don't let videos or streams dictate your impression on the character, you will only know the full extention of the changes and how they affect Sonic's design and gameplay once you get the character in hands after the new version release.
The whole backroom argued a lot about Sonic since the beginning of this project, and we hope you guys to appreciate this character, you who play him, you who watch him play, and you, who play against him.
Thanks everyone for the support on the project.