This looks cool. I've always loved the idea of open tracks, but there's not that many racing games that actually do that (or do it well). Good luck!
Thanks! I've always liked it too, and we'll have to wait and see how well I pull it off... It is an important part of the games design, but it is not something that I feel must be a large component of every track design. One of the current tracks (Brick Moon) takes place on a space station and in it's current version doesn't allow for much alternate routes - I am working on a redesign and it will allow for more alternate routes but still be more 'fixed'/'confined' (can't come up with the right term) in ways of driving than most other tracks. A new track I am working on is in it's current design very open and allows for many different routes (the AI has suprised me quite a few times).
Today I fixed a few bugs with the local multiplayer interface and guide arrows, here's a screenshot:

Player 1 is struggling to get away, just managed to pick up a Shield...
Also started working on another vehicle, or mainly just trying out a few ideas.