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Please provide links/source information for all unambiguous dancer information unless it's been documented in another thread (ex: Vito Mazzo to DNB, Vilanoba to retire), or it will be removed, and Facebook is a source only when it comes from a "Like" (formerly fan) page that is open to the public or a post on a personal page that it is not restricted (ie, you don't have to be "friend" to see it.)
[Admin beanie off]
Madison Kessler: her Twitter description currently reads, "(Warning:I tweet too much) I dance sometimes:Hamburg Ballet,San Francisco Ballet,& soon w/ English National Ballet. I'm just a dancing girl & social media dork.)"
Shion Yuasa: her (public) Facebook profile says she works for Tulsa Ballet, and her page has an album of gorgeous photos from Japan 2013.
Garen Scribner's plans were posted to the SFB blog.
Probably just a waiting game until their new companies make formal announcements of hiring decisions for the 2013 / 2014 season. This is true in the corporate world as well - you are asked not to announce anything or publish on social media until your new company is ready to make the announcement.
Perhaps because companies are noted for selectively updating their websites and putting out press releases over the summer, some of it driven by contractual issues, that ship has sailed, as the above examples show.