Welcome to planDisney, Pierre!
I'm a big fan of your idea to announce your upcoming Disney trip to the kids with a video. My wife and I have done this for our kids in the past. We once sat the kids down and told them we were taking them on a special trip. And then we hit play and the house erupted with Disney joy! My young daughter was running around the room screaming, "I'm gonna ride Big Thunder Mountain... oh, and Splash Mountain... yeaaaah!" It was both hilarious and magical.
Currently, there isn't an official Walt Disney World Resort "trip announcement" video. However, if you go to the
Disney Parks page on YouTube, you might find a video that does the trick. Depending on when your trip is, you could play the
Walt Disney World Resort 50th Anniversary Celebration video. If that's "not your cup of tea" (as we say in England), there's a short, but magical video on the
main page of the Walt Disney World website. If you click "Watch Full Video" then it will give you a full-screen option. Apart from that, you might want to check out the video on the
Vacation Planning page (although that one is more on the theme of Disney Resorts Collection hotels).
There are other fun ways you can reveal an upcoming Disney trip to kids, Pierre. For example, you could design a scavenger hunt where the clues lead to the big reveal. Another idea is to buy everyone matching/customized Walt Disney World t-shirts and give them out to everyone at the same time. Another idea is to literally post a letter to the kids "signed by Mickey" inviting them to Walt Disney World. One last idea is to literally wait until the day of your trip, wake them up, and tell them that TODAY they're going to The Most Magical Place on Earth. Basically, you've got a lot of really fun and magical ways to break this wonderful news, Pierre.
Good luck to you! I'm sure your kids will be over the moon. Thanks for stopping by planDisney. See ya real soon!
Mike