Thanks for the kind feedback!
So far we dont have plans for aerial tricks, but lets see what happens during production. Our plan is to release a small, feature complete game into EA asap and then gather feedback and see what else we can incorporate.
Yes our plan is to have the races in charted courses, but we have not fleshed-out the details of the racing mode yet. We have started our works on the other mode first, so we are not sure for example what graphical assets to use to show the player the direction in racing mode.
The power-ups are very arcady, collecting one power-up will replace the previous one, if any.