Pee from Toolarmy did a search for Tool on the Coast To Coast ticketing site, and it found an entry for the Bonnaroo Festival for the 11th of June.  The Bonnaroo site has a few bands that are playing, but none of them look big enough to be headline acts yet, so Tool could easily fit into the bill.  Given that Tool seem to be joining the festival set this summer, and they’ve played this event in the past, I’d say this is a pretty likely thing.

Would seem to me as though Tool are very much interested in playing festivals at the moment.  If there’s a festival in your part of the US, it’s probably be worth looking into it, and seeing if Tool are a possibility.  Personally, I think the “tour” may just be a collection of festival dates, with maybe a few warm-up shows in LA or something.