Basically, this is an restaurant auboard the Disney cruise ship offering “interactive shows and entertainment headlined by Marvel Studios stars”.

In the new scene, the trio are seated at a table on the upper deck of the Disney ship. Since they have been eating, the clip may be a callback to The Avengers post-credits scene.

While this article does clickbaity “Young Avengers” speculation, the video shown at a press screening can be viewed there. Also includes this statement:

“We are kind of in our own theme park universe, and the Multiverse concept’s great because we’re a Variant of the main MCU timeline, so it helps everyone understand that.”