I've only played about an hour of this, but I'm not sure how I like the two items in this. It definitely makes it more random/chaotic, and the addition of the Boo item is incredibly frustrating. If you're in first or second, it's hard to hold onto any item for longer than 10-15 seconds, as you'll get spammed by Lightning, Boos, or Blue Shells. It's almost laughable how much you'll get your items taken away from you. I liked the introduction of the horn in the Wii U version, so you could combat against the Blue Shell, but now that you can hold two items, and people get lighting and Boos all the time, it just makes it useless, as you'll get those taken away all the time.
I haven't even touched Battle Mode. I'll try that out when I get back home later tonight or tomorrow.