Tetra:
5% Chance - I don't see it happening, largely because of the difficulty it would take to make her a unique moveset. Others may disagree, but I outright refuse to believe Sakurai would spend the insane amount of time necessary to make a new transformation character like Zelda from Melee/Brawl. Not only that, her potential in that case is largely split in two. Tetra has potential for a great solo set, but it's pretty obscured behind allies and props. She's not unpopular, but she definitely lacks the support to back up an undertaking that big. Rosalina was different because once you get down to it, she's a fairly straightforward character, using the Luma as a minion. It's tougher when you have to use human companions as a protagonist, and I don't know if we'd ever see that in Smash Bros. If he didn't do that, a set could be made, but again, it's simply not unique - it'd have similarities to Toon Link because of the shape (not huge similarities, but they'd be there) plus there are so many sword users. If she's going to use magic, she's aping on Zelda and steps into clone territory. I also don't think the character especially deserves a spot, compared to Ganondorf who could much more easily have an original set made from Wind Waker and desperately needs one.
5% Want - I don't like the character and nothing she could do in a set appeals to me as a player. There are other characters like K. Rool who are much better pirates and in Zelda, Ghirahim operates as a better summoner, while Tingle is a far superior low-tier weight/size to take advantage of that. The only reason I'd want her is for her supporters.
No Namco Newcomer:
40% Chance - Lets ignore Pac-Man for a moment who is a fifty-fifty toss up, as that's a discussion for tomorrow apparently. What else Namco has is not as iconic or deserving by a country mile, but they add a whole ten percent because of how many there are. Lloyd Irving from Tales had a gigantic support base for a time but that dwindled, Tekken has a gallery of characters to choose from and there are many games Namco publishes that could, I'm sure, be used to make great sets for Smash Bros. What hurts their chances is that quote from Sakurai about Namco getting no special preference. It won't affect Pac-Man, however it would hint at other companies having a fair chance and I doubt Namco's tertiary selection trumps, I don't know, Konami's. It makes the likelihood of a lesser known Namco rep almost nil. Ultimately I'd give about 5-10% for Lloyd and some extra for a completely random, unpredictable pick.
0% Want - It's hard to think about how much you want to not have a newcomer. When you add in Pac-Man, that is already a resounding no, but casting out every single Namco rep alongside him makes it hard for me to say I want that. Unless we get into the speculative math of how a Namco newcomer would hurt other newcomers and I just don't think it would. Third-parties don't really factor into those kinds of arguments, and against one another, Simon Belmont is not going to be hurt by Pac-Man, if Sakurai wanted to he'd add both.
Pac-Man Prediction: 61.5%
THE PAC IS BACK
Goku x5