June? Excellent news!
Answer to my other questions:
1. Are vehicles based / not based / doesn't matter?
Shouldn't matter if based or not - so long as you can hold the measurement template up against the car in a consistent manner (and weapons/armour etc don't get in the way).
2. How many cars per side for a typical game?
We've done a 'purchase' set of costs to the cars, so you 'buy' the numbers of cars. I haven't seen this yet, so can't tell you for sure - I envisage 2-3 different cars, depending on scenarios.