I wouldn't count on those scenes being canon, but we'll see I guess...It's not Biggs. Or, at least, it better not be. At the point this movie takes place, Biggs is just finishing up at the Outer Rim Merchantmarine Academy (or whatever it's called), and concocting plans with a couple friend to jump ship and try to hook up with the Rebels.
Unless they're flushing the Anchorhead scenes. I really hope they aren't. Yeah, they're deleted scenes and thus not actually canon, but still...