I was wrong. Let me start with that statement.
I've argued with various folks online about how Nintendo would handle the inclusion of Mewtwo's addition to Smash Bros. for 3DS and Wii U this coming spring. "Why would they mention that he's 'free' if he wasn't going to be a paid option as well?" I typed furiously on more than one occasion. I mean, come on, no company would make you buy two games (that are very similar and for two separate consoles) to get one highly sought after character, right?
In a recent interview Smash Bros. producer Masahiro Sakurai was asked about Mewtwo and if players will be able to purchase him outside of the "Buy both our games" deal. Here is his response.
"As for why Mewtwo isn't paid content from the start, releasing that character is an experiment meant to act as a foothold in content distribution; thus it's simply meant as part of the service we're providing to gamers."
"Creating a single fighter involves a huge investment, and we've already been giving it our all and investing a lot of work in the characters currently available in the game, and I think it's an incredible package in terms of the sheer amount of content in the game. But it might be that people may not understand and may think that I am not offering enough just by looking at DLC itself."
"…What I can say now about paid DLC is that we aren't working on anything at the moment. We've put all our efforts into making the actual game. Creating DLC would involve large additional costs and require the involvement of a lot of people."
So not only is Mewtwo not going to be paid DLC (at least form the start), there isn't even any other DLC in the works currently. Sad. Hopefully the success of Nintendo's recent Mario Kart 8 and Hyrule Warriors DLC will push Sakurai and his team in the right direction. It's understanding that it takes a lot of time and effort, but everyone knows it would sell better than any Nintendo DLC to date.