Despite the above news story, so far Arrow only shows Acela's blocked out thru Sunday night. At present one can still make reservations for Acela Express service on Monday the 18th.
We'll see if that changes in the near future. However, with 1,440 disc brake assemblies to inspect and possibly repair/replace, I'm sure it will take some time. And if replacements are needed, that could be a big problem as I can't imagine that anyone has that many disc brake assemblies just sitting around.