quote TreIII, NeoGAF

The way this is working is like so:

The name of the site that's been linked and quoted a number of times by now is "Fighter's Front Line". They are renowned for being a veritable source when it comes to Vs. Fighting games, amongst the Japanese.

So, then this page on said site was found on 2ch by some one several days ago. It not only does such things like seemingly confirm how much the game's arcade board will cost, but it lists what console the game is seemingly destined for.

Yes, it's true that this is not an official Capcom announcement. But like other reputable Japanese blogs, such as "Soutahouse", they have no reason to falsify information, as they have a reputation to maintain.

Thus, why people are basically willing to throw their lots behind this "confirmation". If it was just a random 2ch rumor, than it would be treated as such. But the rules change once when you start having credible sites involved, with their own credibility on the line, to match.

Feel free to wait for an official confirmation, as I'm going to do so as well, before I start celebrating. But again, at this stage in the game, we're basically looking at 80% confirmation, right here.