That didn't take too long, did it? That pulled EVO 4G update promising a handful of fixes for WiFi, Exchange, and battery life (no Froyo yet, sorry) is back online according to our contacts at Sprint -- and indeed, we're getting prompted on our own unit, so that's that. Go forth, readers; get your update on, now with less brick than ever before.
[Thanks to everyone who sent this in]
Update: To be clear, you don't need to apply this update if you already have done so successfully -- the only change that we're aware of here is that attempting to apply the update multiple times won't kill the phone.