The new Targeting
As you move the targeting crosshair around (hidden when looking forwards), a selection of 6 targets will be specially highlighted. Pressing the target button, the radar will cycle between these targets. Most importantly, this selection is prioritized by threat, so AAA like Shilkas will be targeted before a tank that is not a threat.

Anti-aircraft vehicles also now have a unique targeting icon to make it easier to pick them out.

It's worth mentioning again that the targeting is based around the screen center, allowing you to target by looking at something. When off-boresight, a small crosshair will appear in the center of the screen to give you a reference point to aim with.
Changelog:
New Features:
- Added key (Shift-H by default) to toggle visibility of Arena symbology while flying
Improvements:
- Targeting logic creates a group of selectable objects
- Target button cycles between this group of objects
- Selectable objects are prioritized by type so that threats are targeted first
Bugfixes:
- Fixed bug where errors could be thrown by bullets when leaving Arena mode
- Strela classified as SAM instead of vehicle
Changed depots in testers branch