FOR THOSE OF YOU WANTING TO KNOW...SOME SPOILERS...
The sets:
-Underwater-There's two giant tower things on either side of the stage with long "branch" things on the side, the branch looking things lift up and down, which is used during Under The Sea to let some of the fish "swim." On the ground, there's a series of plexiglass wave-things that lower into the stage when the story is on land. There's also a large round blue diamond-looking thing that hangs in the back.
-Ursula's lair-It's almost all dark, with some lighting being projected against a screen in back with lights that writhe around like tentacles. There's a GIANT glowing orb that Ursula sits in like a throne that Flotsam & Jetsam usually wheel on. Also, a lot of green lighting is used.
-Prince Eric's Palace/land-The lighting changes from blues and greens to more orange and bright colors. The screen in back is made to look like the inside of the palace, the towers seem to change colors to reflect the palace setting, and the diamond-thing in back flips and turns to an orange-ish color to reflect the sun. When in the palace, it turns horizontal and the center lifts up to make it look like a chandelier.
-The ship-Prince Eric's ship lowers down and sits about halfway above the stage, with fiberglass waves rising up to look like it's sailing on the ocean.
The costumes:
Ariel/The mermaids-All fairly simple. They all have the shell-bikini tops, different colors. Their bottoms are long skirts, with tails that come off the back, at about the knee.
Ursula-Black floor-length dress, the part of her chest you can see is painted a pale blueish/white color, her face is a similair color. Her tentacles sort of drape off around her like a skirt. A few points in the show, they lift up and form a sort-of circle around her(it might be hard to visualize, but it looks fangoddamntastic when you see it).
Flotsam & Jetsam-They're green. They're wearing full body leotard-esque things that are pretty loose fitting, and look like they have plastic scales sewn on to them, they have hoods with mohawk-esque things on them(sort of like what they had in the movie). Also, on their heads they have two long, narrow patches that glow when the lights are out, which is how they do their glowing eyes for the show. Their faces have a few spots painted green(noses, cheeks, etc)
Sebastian-He's dressed similair to Zazu in the Lion King. A red suit, with a small red top hat with crab eyes on it. His face is painted red in some spots.
Scuttle-Is a mess. He has a sort of white feather jacket thing on, with what looks like a red pot on his head with a beak attatched to it. He's got dark shorts, and black & yellow striped tights under those with long red clown boots on.
Flounder-Simple. His hair was spiked up and was blue on top. He was wearing a long yellow shirt with blue spots and stripes on it.
Triton-Similair to the movie. He didn't have the giant crown though.
Prince Eric-Just like the movie. VVVVEEEEEEEERRRRRYYYYY tight pants.
And here's a full song list if you're interested:
ACT I
Fathoms Below/Where I Belong-Prince Eric, Grimsby, sailors
Daughters Of Triton-Mersisters
The World Above-Ariel
Human Stuff-Scuttle, Gulls
I Want The Good Times Back-Ursula, Flotsam & Jetsam
Part Of Your World-Ariel
Part Of Your World(Reprise)-Ariel
She's In Love-Mersisters, Flounder
Her Voice-Prince Eric
The World Above(Reprise)-Triton
Under The Sea-Sebastian, Sea Creatures
Sweet Child-Flotsam & Jetsam
Poor Unfortunate Souls-Ursula
ACT II
Positoovity-Scuttle, Gulls
Beyond My Wildest Dreams-Ariel, Carlotta, the Maids
Les Poissons-Chef Louis
Les Poissons(Reprise)-Chef Louis, Chefs
One Step Closer-Prince Eric
I Want The Good Times Back(Reprise)-Ursula
Kiss The Girl-Sebastian, Animals
Sweet Child(Reprise)-Flotsam & Jetsam
If Only/Her Voice (Quartet)-Ariel, Prince Eric, Sebastian, Triton
Her Voice(Reprise)-Ursula
The Contest-Grimsby, Princesses
Poor Unfortunate Souls(Reprise)-Ursula
If Only(Reprise)-Triton
Finale Ultimo-Ariel, Prince Eric, company
"I am the Phantom of the Opera! I'm the gayest supervillian ever! OoooOOOooooOOOoooh...Beware of my scented candles...OoooOOOooooh...Scented!"