From Reddit by way of Facebook, the boilerplate responses from Universal seem to have coalesced into this:
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The language is very deliberate, treating "Scream Early" and "Stay & Scream" as separate entities. (AP early entry always was classified as a form of "S&S," with an AP being a "day ticket.") These feels more like it was drafted by Legal than a typical tweet. As bad as it seems from a logistics standpoint, this language strongly implies another level of upcharge.
Adds a new wrinkle -- are the Scream Early and S&S houses the same? Last year S&S could in theory line up at any house, even if it wouldn't open for a while. Will the SE houses be off-limits to 5? Also I doubt they offer Express from 2 - 5, although I can't imagine needing it.
As always, until we see it on a website it's subject to change, but at least keeping that option open.