Not in the least, but then the sequels to those games added new characters (and occasionally took old ones away), new stages, etc. Is that the case here? Honest question, mind you, because I've yet to hear that it is. From where I'm standing, it looks like the original Punch-Out with better graphics, a new multiplayer mode, and some tweaks.
Look at it this way: under your reasoning, Resident Evil on the Gamecube was NOT a remake because it has stuff that the original didn't. We know that's not the case, of course. In fact, I venture that aside from adding multiplayer the REmake had more dramatic changes between the original game and its modern reimagining. The only thing that favors NOT calling Punch-Out!! a remake is that Nintendo said it's a "new game," but they've yet to show me any reason why "remake" shouldn't apply.
Keep in mind that I'm hardly insulting the game by calling it a remake. Remakes can be great (see: REmake, Klonoa, most likely Boy and His Blob, and tons more). I know that has a negative connotation in some folks' mind (nevermind that most of 'em never played the original), which is likely why Nintendo's taken the tack it has, but as near as I can tell this is, in fact a remake. Care to change my mind? I'm all ears.
There are new charactersat the very least. I am trying to track down the press release I saw it in but am having some trouble. Wikipedia has new characters and new moves listed, but with no source. Of course Wikipedia also lists it as a "re-imagining" of the title so it more or less keeps the debate at a stand still. What it is officially labeled as is largely irrelevant iif ya ask me. Just want to make sure the right info is out there.
Edit: Re-imagination is the official tagline given by Nintendo. I imagine this will be similar to what happened with Prince of Persia.