I wonder if this means they'll be showing 2 new characters every week until release now. Because if it is then we can now get a good idea of how many characters will be in the game.
Since Nintendo's latest release shows this wont be coming out anytime between now and September, the earliest the game could come out is October. Now there are exactly 18 more Wednesday's before the first Wednesday in October, meaning if you add Mario and Link to that, you'd have 38 characters total for a first week October release.
But I think closer to launch they might lower it to one character per week but still, if it goes like this it seems that the game will have an October release with what looks like somewhere around 40 characters.
Plus this actually makes sense since Nintendo has said Mario Galaxy will also come out this year. Now Nintendo would never release both games too close to each other but two months apart sounds about right. Which is why I'm seeing Smash Bros getting an October release while Mario gets a December release.
I'm going to go on the record now and say Smash Bros Brawl is going to be released on either October 15, 22, or 29th and have somewhere between 38 - 42 characters.