I dont see the point. The way you jump on a koopa and its just the shell is pretty much the same in every mario game.Thats what I see you getting to I guess but still opinions overrule all because what I think as fresh may not be fresh to you. You picked probably the most miniscule thing to deviate the game from being fresh.
I know my opinion is different, and if you think this game is the freshest thing since the word freshness was invented, then that is an opinion you are welcome to. Different opinions are awesome.
To elaborate on mine further - this game is the opposite of fresh. Its visual style is heavily derived from an (it has to be said) ugly DS game - as fun as it was. They are clearly recycling boss movements and animations, as shown in the earlier gif, and its getting to the point where New Super Mario Bros Wii U looks like a HD mod of New Super Mario Bros Wii, which looked like a modded upressed port of New Super Mario Bros DS with four player nailed on.
Here's how I'd present freshness in the history of this series. Going from
Super Mario World's rather functional boss encounters:
to
Super Mario World 2's completely fresh approach:
And this was on the same console with mostly the same capabilities! (well, a few extra chips in the YI cart not withstanding).
As I said, I'll be buying New Super Mario Bros Wii U, and will enjoy it. But its the fourth time Nintendo have recycled/semi-recycled regurgitated content. Its the opposite of fresh. Its stale.