He changed his Monado mode at least once during the footage. I can't recall which mode it was but a speed or evasion buff could make his moves twitchier.
Monado Buster
Monado Enchant
Monado Shield
Monado Speed
Monado Purge
Monado Armor
Monado Cyclone
Monado Eater
I saw three Monado arts being used during that bit of footage. Except, they aren't buffs like they are in the game, but "modes" that Shulk is cycling through. That's what this leaker says in regards to them, anyways:
"Shulk has like 5 different mode swaps"
That fits, because we didn't see him using any of the physical Monado Arts (Buster, Cyclone, and Eater) during the fight, so that leaves us with the five Monado Arts that affect his status (Enchant, Shield, Speed, Purge, and Armor). Now, don't quote me on this, but I think I saw him cycle through three kanji; the first two I can't make out for sure, but the last one was definitely 疾 (shitsu, Monado Speed). What's more, in Xenoblade, the light of Monado's beam changes depending on the Art being used.
Buster: Blue
Enchant: Violet
Shield: Yellow
Speed: Light blue
Purge: Green
Armour: Orange
Cyclone: White
Eater: Black
Here, I can't tell if that happens with the blade's beam, but the kanji are definitely changing colors, at the very least. First, we had purple (Enchant), then green (Purge), and finally, light blue (Speed).
That's what I saw, anyways. All that aside, I can't wait to get my hands on him; sounds like he's going to be incredibly versatile.