We drove most of the night sleeping for a couple of hours en route, and were first in the car park this morning at 7.30am. We spent the morning in the main park, but then went back to the car for a nap at lunchtime. Dd had to pick a famous person to do a report on over the holidays and has picked Walt Disney, so I suggested doing some research especially at the Studio Park. So when we went to the Studio park this afternoon, and I said "let's have a walk around the new part", I did not know that a soft opening of Cars was planned for today and we got a shock to see people on it. We walked up expecting to be challenged, the queue was so short that we thought it must only be certain groups of people allowed on. But no, just typical Studio park short queues (we have been on RnR twice with no real wait, it said 5 minutes but we went straight through).
We thought it was different and were not sure if we really liked it or not, so we went on Tram Tour - which the entrance to which is currently via Toon Town - and then went on it twice again. The final joint opinion was that it is a good addition to the Studio Park.
There is no real height restriction for kids, that we noticed although I would say not suitable for under 3s because you have just a lap belt to hold you in and you are thrown about with a reasonable force. It is funny because you think that you are going to crash, but the cars just miss one another.
There are 12 cars, two groups of six. Each car seats four, including upto two adults. The back seat (has a slightly padded back) would take two smallish adults or one adult and one child. The front seat is not overly comfortable, but not too squashed for one adult and child although I think that probably one adult and a teenager would not fit on it. Each person has their own lap belt.
We have never watched the Cars film and never had more than five minutes wait so could not comment on the theming of the queue.
We saw Cruster Coaster going round, but with no people on it and asked about when it was going to be opened - "4th to 8th June for annual pass holders" we were told - this does look to be more exciting, and dd enjoys her roller coasters (but we were also told that the height limit is likely to be 1.2m).