"Tab" key will toggle the frontal and horizontal views. A list of key controls is in the 0.2 devlog. There's also a button for joystick/gamepad to toggle frontal/horizontal. You can also use right mouse button and drag the volume around, this works both in the full view and the nav window.
Other vehicle classes have not been added yet. 4d rotorcraft will be the hardest, both for me to make and also to play, so that will be added last. I'd like to add ground vehicles soon but also more gameplay (racing mechanics) and I need to do some code maintenance.
You should be getting emails within 24 hours after a devlog/update, just make sure it's enabled in your account settings.