While talking with a Valley metro project manager last night during the test, he told me that the trains would
never go over 35 mph while on
any street, regardless of the street's posted speed limit. The only opportunity for the trains to go faster (at least on the starter segment) are on parts of the line where they don't share the RoW with cars, mainly the segment near the town lake bridge.
However, he did say that the trains will still be able to go end-to-end in 1 hour, thanks to the modified predictive-priority operation. He also said that the top travel time from Tempe to DT will be 20 minutes or less.
A couple of other things he mentioned: a fare structure that will be the same for trains and buses, and the ability to buy daily, weekly, and monthly passes, probably at reduced rates.