I'm at a loss as to what changes Bowser could reasonably be getting. We've gotten small, insignificant buffs every one of the last four patches, and every idea that I did have was already covered. Except for the critical things like Klaw positional hitbox and Bowsercide being fixed.
I could see a buff to Fire Breath. Possibly a change to one of our throws. Despite our lack of a combo throw, our throws are still above average when you look at the whole cast. 10-12% damage output, two can kill with rage (and Bowser gets a lot of rage by virtue of being so heavy). Dthrow has no use, but it's still there for keeping F and B throws unstaled for later.
I'd like to see Uair and Bair get a landing lag reduction of about 4 frames. Bair's 40 is just excessive and is way more than Ganondorf's almost as strong Fair and Bair that have 23 and 20 respectively. Uair's 28 also bothers me because unlike Nair and Fair, Bowser's Uair is a more subtle motion of ramming his horns upward. The rest of his body isn't doing anything that would warrant such a hard landing. And finally, if they could reduce the weight based knockback of Bowser Bomb's rising hit, that would allow it to stop whiffing so often when we have rage. I've never seen Bowser whiff the falling hit because he was too close, but I often see it when he uses the move at maximum range. It's a total liability to punish with Bomb when Bowser has too much damage, and seeing this issue fixed would be a huge help.
Anyway, I'll be working on the community patch notes for all of tomorrow, so I'll let you know when/if I find something.