SO! Here's what I thought I'd do. Instead of coloring the entire thing in one shebang, I came with an idea. Until the time of the release (when I'll color the entire thing), I'll only ink and color those characters which have been confirmed as playable! And those I haven't added, such as the Trainer and Villager, I will. So there you have it, my Super Smash Brothers 4 dream roster.

Currently filled in characters:
Mario, Link, Samus Aran, Bowser, Fox McCloud,Kirby, Captain Olimar and the Pikmin, Pikachu, Donkey Kong, Pit, Mega Man, Wii Fit Trainer, and The Villager.

Updates:
(8/07/13) Luigi time! That didn't take long at all!
(9/12/13) Princess Peach is back, resplendent in pink.
(9/26/13) Who's that kid with the big eyes? Toon Link is back!
(10/01/13) And here's the blue blur, Sonic the Hedgehog returns!
(11/07/13) Who's that Bishimon? It's Marth!
(12/18/13) Surprise surprise, Rosalina and Luma float on in!
(12/25/13) Assist Me! Starfy, you're being helpful again?
(12/26/13) Da-na-nana! You got: Princess Zelda!
(1/10/14) The once and future King Dedede!
(1/32/14) You caught a Lucario! It has been sent to your roster.
(2/13/14) I'm absolutely floored! Little Mac punches in!
(2/21/14) He's one tough Kong! DK! Diddy Kong!
(4/8/14) Fully heeled, Zero Suit Samus is back!
(4/8/14) She's tres chic, Sheik is back!
(4/8/14) There's no egg on his face, it's Yoshi!
(4/8/14) Who split up the group? Charizard is on his own!
(4/8/14) The watery shadow moves without revealing itself, Greninja attacks!
(4/8/14) Assist Me! Mama Mia, it's Saki Amamiya!
(5/2/14) Assist Me! Dillon rolls out!
(5/23/14) I like Ike! He fights for his friends!
(6/10/14) Dare you fight... MII?! Mii Fighter joins the fight!
(6/10/14) Help me Lady Palutena!
(6/10/14) WAKKA WAKKA WAKKA! Pac-Man Confirmed!
(6/10/14) Beep beep beep, I've been missing you, Mr. Game & Watch!
(6/11/14) Assist Me! Tingle Tingle Kooloo Limpah!
(7/14/14) HIS NAME IS THE CAPTAIN! Captain Falcon returns!
(7/14/14) Take my hand... Robin joins the army!
(7/14/14) Fighting for tomorrow today, Lucina is ready!
(7/28/14) Assist Me! Takamaru's ready to unravel the mystery!
(4/8/14) Finalize It! Tom Nook's charging a fortune for the Villager's Final Smash!
(8/13/14) You are so meta! Meta Knight returns!
(8/29/14) Monado! Lend us your power! Shulk joins your party!
(8/29/14) Assist Me! What's your brain age, Dr. Kawashima?
(8/29/14) Assist Me! Slippy To-...Wait! Who's that Pokemon?! It's Zoroark!

(1/5/15) Added Muddy Mole, Hakkun, Duck Hunt, Solid Snake, Lip, Bubbles, Jigglypuff, Marshal, ROB, and Barbara Bat.
(1/5/15) Added Ness, Andy, Wario, Demiru, Pichu, and Squirtle.
(2/22/15) Added Kalas, Chibi-Robo, John Raimi, Doshin the Giant, Dr. Mario, Jill, Geno, Monita, Sukapon, Lassi, Lucas, Prof. Layton, Vaati, Wario, Krystal, Pokemon Trainer, and Nester. (I need to update more often.)
(9/21/15) Added Ridley, Ivysaur, Balloon Fighter, Ganondorf, Roy, Dark Pit, Bowser Jr., Alex Roivas, Mewtwo, the Ice Climbers, Falco, Isaac, Mike Jones, Wolf O'Donnell, Ray Mk. I, Ryu, and Inkling.

(UPDATE) FREAKING DONE. Someday I might throw in a proper background and shade everyone nicely, but for now, this sucker's DONE. I've got all the characters, added in Ryu, and that's it. Phew.

(UPDATE) So... yeah it's been a while. Game came out, I had work to do, and so the whole thing went on hold. BUT I'm back and filling the WHOLE THING IN now, so first comes coloring in all the characters and adding a few (such as Dark Pit and Bowser Jr.) and once I've got everyone inked and colored, I'll be adding a background and shading it. Although for a few characters there was special shading, like Hakkun's transparent body.

So I'll update the image each time a new character is revealed as being in the game, until then they'll remain as sketch outlines, and if someone I didn't sketch shows up I'll them in somehow. When every playable character has been confirmed, I'll just finish the image up with proper shading and a background. I do have a nice background I'm working on for this that should look fairly nice when it's done, but that'll be much, MUCH later.

...So I haven't updated this in a few months. That Direct hit me with a lot of info and I had to think about how I was going to change things. Since ZSS, Sheik, and Charizard are now separate characters, I decided I had to add to the image again. And since they're separate, I added a few more newcomers I was hoping for, including Dr. Kawashima, Mii, and why the heck not, Ridley. So hopefully from now on I'll keep updated.

...And I realized Tom Nook was shown to be part of The Villager's Final Smash, much as Chrom is part of Robin's. Bonus points if you recognize the piece of paper he's showing Princess Peach!