Shulk's stat-changing special is in perfect alignment with the Ninka leak.
At first, they only gave examples of two swaps - the red and the blue.
They later added on that there were "like 5"
And there are indeed 5 -
Jump - Higher jumps, lower defense
Speed - faster movement, weaker attacks
Shield - higher defense, slower movement
Buster - stronger attacks, weaker launch ability
Smash - Stronger launch ability, weaker attacks, lower defense against launching
I don't think these actually change his moveset at all, just his stats. The fact that Sakurai's miiverse post said "change Shulk's features and abilities" is imo just a poor choice of words and not him actually meaning the moveset changes too.