OK.... let's not lose out heads YET, but uhhhhhh....
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I try to keep myself at a very reasonable level of hype and accept that the possibilities of Shantae as a fighter are not extraordinarily high and that this Tweet is probably for a different game, but Jesus is this tease of a tweet getting my tin foil hat charged up. Please don't be nothing please don't be nothing please don't be nothing...
As for the Disney World Thing, it's likely for this:
http://disney.wikia.com/wiki/AVATAR_Flight_of_Passage
Oh wow I never knew she did work for Theme Parks too! I've actually ridden on that one. Freaking amazing ride.
Anyways, to add my two cents on the whole Vergeben leaks situation, I'd be lying if I said I wasn't concerned but hear me out for a bit. This is just me theorizing so I might be completely wrong but this is what I'm thinking based on what we know.
Putting my own doubts about his credibility aside and assuming he's 100% legit with his info, I'd still say that I have a feeling that he's gonna be smoked out soon if he hasn't already, or he's gonna go dark. Loz18 is another case where he had some very legitimate info but was later smoked out. With Sakurai's legendary hatred of leaks it makes sense that he would take every precaution available and compartmentalize his work. Whenever leaks of this nature happen I'd wouldn't put my bet on any of the development team actually being the leakers, they have their whole careers on the line if they break NDA and with no obvious financial or notoriety benefit from it, no one would risk it. I'd say that 99% of legit leaks come from people like janitors, coffee boys, minor assistants, etc, people that are below notice but can get close enough to snap a quick picture or see a juicy bit of the game for a quick second which is then reported to guys like Vergeben that compile and cross-reference them before anonymously sharing them online.
The problem with this is that Treehouse is constantly surveying every bit of relevant Nintendo info online and will catch on which leaks are legit or just ****posting. This will be reported back to Sakurai and he'll know exactly what department worked on what part got successfully leaked and suddenly security gets locked down and no one is beneath suspicion anymore. Once that happens I'd say that any chance of getting new info from that source goes down to nil.
Trying to piece together a timeline of events, it seems that Loz18 definitely got a hold of some good info, but once Sakurai's team figured out which department leaked what, he was fed purposely wrong info and got smoked out, probably after he got too bold and carelessly thought he could rely on the same sources without consequence. Vergeben seems to be far more careful and avoided it for now, but after Castlevania and Isabelle, it's inevitable that Treehouse is reporting all of this to Nintendo and they're working on figuring out what department(s) specifically leaked what info (if they haven't figured it out already). Once this happens only one of two things are gonna happen, either Vergeben is gonna get fed wrong info and get smoked out, or if he's as meticulous and careful as I think he is, he'll stop rolling the dice and go dark, getting only tiny amounts of info in a dripfeed if any at all.
If Shantae is in the game, I think a surprise as big as her (the first playable indie rep, that's huge) is gonna be carefully watched over by Sakurai personally, and if he wasn't ultra paranoid about leaks before I'd say he must be now. A lack of Shantae in online leaks is not surprising to me at all in that case, as it would mean that the info that Vergeben has so far is the only info he managed to grab a hold of before the Nintendo Ninjas start trying to sniff him out, making his work that much harder.
I guess what this TLDR post is meant to say is I don't think that Shantae is guaranteed for Smash, but at the same time, don't fret too bad about her lack of presence in leaks, cause even if their info turns out to be legit (a big "if" in my opinion), that does not mean they have a complete picture and Shantae could have been missed in the shuffle (assuming she's in the game of course).