Played lots of bowser at the bestbuy event, won almost every match I played with him. Very strong, much faster, and recovery seemed better with the up-b high as well. As for giga-bowser, it was meh. Landmaster seemed much more powerful.
Specifics:
F-air - Still very good, great hitbox and speed.
B-air - Much faster, is now a drop kick with a large hitbox and strong knockback. Was able to get many chase kills off the stage with this and bowser's strong horizontal recovery.
N-air - Seemed better if only due to increased range, not sure if really useful still.
D-air - Now drops like a divekick when used, was much strong, think of it like a less risk less reward Down B.
U-air - Seemed a little faster, but a little less powerful, but I could be wrong about the power.
F-tilt - Mostly the same, fast and hard-hitting.
D-tilt - Huge damage if both hit (25%~), maybe a few frames faster.
U-tilt - Never got to use it cuz I don't normally have tap jump on and avoided it like the plague.
A-combo - Punches instead of swipes, similar speed power(?)
Dash Attack - Much safer it seemed, and his dash is faster in acceleration so this seemed a nice change.
Neutral B - Looked like longer range, but seemed like it took longer to change it's direction
Side B - Still the flying slam, range and speed were solid, but mostly the same. Cannot Koopa Hop.
Down B - Mostly the same, still does large damage to shields, but unsafe as usual.
Up B - More vertical recovery, horizontal similar. Probably still had invincibility on the ground, I seemed to be able to Up B out of shield pretty reliably when pressured.
F-smash - Is now a sweet dropkick. Has huge range, very meaty, and has great power. Only one hit as far as I know, but seemed more useful overall for punishing rolls dodges and even whiffed moves from further out due to the range.
U-smash - Seemed mostly the same, power still ok, couldn't tell if there was a hitbox on landing still, no one was ever under me like that.
D-smash - Again mostly the same, still great for punishing rolls behind you, but not much change.
Overall I think bowser to be a very strong contender, I think he will be a destructive force early on if nothing else.
. I'm not sure if it's all grabs in general or just Bowser, but there seems to be a lot more invicibility frames on grabbing. Whirling Fortress OoS is till a thing. Seems there's more shield stun. More than brawl but not as much as PM/Melee.
