We did get warned about a lack of newcomers. I can see where Sakurai is coming from. From Melee to Brawl, we had a ton of options to choose from. We had Wario, Meta Knight, King Dedede, Pit, and Diddy Kong; these are characters that people wanted to see in Smash for such a long time. Now, we are running out of options. We do have some notable characters left like Little Mac, King K. Rool, Ridley, Palutena, the rise of characters like Shulk and Chrom, and a return of Mewtwo.
Here's the thing: We will get cuts, Sakurai warned us about this as well. Not every character will come back. However, Lucario was a character that I thought could potentially be cut, but I was confident that it wouldn't happen. Seeing him now and see as how he was a character that people thought was on the chopping-block (as well as Toon Link) makes me think that we might get a large majority of Brawl's roster back. Say what you want about Wolf, but he definitely has some fight in him. Ike is also rather popular in my eyes, so I can't see him get cut. The only characters that I can see get cut are Snake and the Pokemon Trainer (mostly to free up time and resources).
In summary: There aren't as many characters left to possibly add in Smash. We will get a majority of Brawl's roster, but we are guaranteed to get cuts.