No, Sakurai really is hinting that Ridley is going to be a boss. It's pretty obvious the context is.
I disagree entirely. I think that if Ridley was going to be a boss, he'd have been revealed as one already. Think about it. What good would all these hints have done if they meant exactly what they implied? That'd be stupid. Revealing him as a boss now would only piss people off. That's why I'm very confident in him being playable.
I'd suggest cutting Robin and Snake for Chrom and PacMan respectively, then add in Shulk, because you don't have enough characters
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G0LD3N L0TUS
And Mewtwo.
50 characters, perfect.
I'll just go over every suggestion here quickly:
Cut Robin for Chrom: I think Chrom is more likely, but because this isn't a prediction, I went with the option that, while still reasonable, would be the most interesting to play as, IMO.
Cut Snake for Pac-Man: The way I see it, Snake is already a well received 3rd Party character. Without a good reason to cut him, and especially cut him for another 3rd Party that I don't consider nearly as interesting, he won't move. Again, this isn't a prediction.
Add Shulk: Personally, I don't think any more misc. are necessary. We already have three more, and those three, in my opinion, were the only ones that stood up to the likes of Star Fox and Pikmin. Don't get me wrong. I LOVE Xenoblade, and LOVE Shulk. I just don't think any of the remaining misc. series would be able to stand up to what we have.
Add Mewtwo: Already went over him earlier, so here's the short version. I don't want to cut Jigglypuff for him, and I don't want to just cram him into a roster that I already consider nice and complete. After all, he isn't a necessity.