Yes! Christina Tosi is gettin' really messy again this season, at least once. Also in the previews the other guy got into a giant milkshake, so maybe Christina get involved in this one too. Here are some caps from the quick preview for the upcoming episodes.

It's incredibly cool that a) some production exec decided the messy parts in what's actually a cooking show should exist to start with and b) Christina is up for getting covered quite thoroughly in slop every season.

However, just to anticipate any potential disappointment, in another video Gordon talks of his favourite moment being 'sticking my fellow judge Dan into a giant milkshake'. Not 'fellow judgeS Dan AND Christina'. Hoping this is just a figure of speech and they all go in...

Fox has posted the first part on YouTube (just the yellow gunk). Look for "Gordon, Christina, & Joe Get Frosted" with a "MasterChef Junior" search. Below is a gif from the second part which will surely get posted by someone soon (sorry for my cap quality):