Oh. I...hadn't expected that meaning. I mean, if that's what you're going for, it's basically a truism. "More info will come at some point after this event that will happen really soon." Well, yes, they'll almost certainly say more release things eventually, and "eventually" almost surely entails a time the day of, or any day after, the release of SCAG. I figured the only reason to highlight the relationship to the SCAG release date was to imply proximity to it; otherwise, it would be no different from saying, "I'm sure we'll hear something when there's something to hear."
But maybe I'm just splitting hairs now. Fact is, the OP's question is pretty decisively answered: no, we really don't know anything (official/provable) about the "next release," other than the "Shakespeare-inspired Giants story" pseudo-summary of the next adventure path. (I mean, really, "Shakespeare-inspired" etc.? Everything from King Lear and Hamlet to A Midsummer Night's Dream and The Taming of the Shrew qualifies there--plus some decidedly unsavory things like Titus Andronicus. At this point, given Shakespeare's influence on modern English, it's hard to call a native English work not "inspired" by Shakespeare to one degree or another!)