Signs are pointing to a UK vs US duel version of the format, which has worked quite well in Scandinavia (although the production company have been playing around with various duel format for about ten years, it only really feels like last year they've found one that works). I'm not crazy about the show as a two team affair, they tried it in France last year and although I thought it was quite clever it tanked, so they're going back to a one team affair this year and doing up the cells fantastically in one final throw of the dice.
The Swedish show has gone down better I think but I doubt a UK vs US show will work like that because it gets rid of a team at the halfway point and you don't really want to alienate half your potential audience.
They've done a kid's special on the French show several years ago for the show's 15th season. It is fair to say kids make up a large percentage of the show's audience - same with Crystal Maze really.
Will kids watching kids have the same appeal as kids watching adults mess things up? Pass. The Crystal Maze kids specials were quite good fun, but the attraction for me (as a kid at the time) was that it acted as a sneak preview for some of next year's games. I would not like to suggest this was an average viewpoint.