It's from the Gamefaq boards so you know it's true.
Take it for what you will....EBF has confirmed Ness as a playable character!
He knew about the Franklin Badge, New Pork City stage, and playable Lucas weeks before they were confirmed.
"Get to Chapter 3 in Adventure mode, and progress all the way through to the end (save the game during the last checkpoint just in case you lose the upcoming boss battle). There's a cutscene in which Lucas is approached by Porky (in his spider mech), who backs Lucas up the edge of a cliff, with nowhere to turn. One of Porky's machine's mechanized legs lifts up about to attack Lucas, when the mechanized leg is hit with a sudden PK blast from behind. Porky turns around and Ness is standing there. The cutscene transitions into a Lucas (P1) & Ness vs. Porky boss battle. Damage the mech until the HP bar at the top of the screen drains out, but watch out for the spider legs, as they cause quite a bit of damage. When you defeat Porky, Ness will be unlocked. -EBF"
Looks like ChaosZero is correct (so far)...