One of the forum moderators for WW3 let slip that 0.4 is headed to PTE soon. The dev team has been taking extra time to stamp out the bugs causing crashes after 0.3. This will likely still mean a January release. The same mod mentioned the new combat helicopter drone which will be the WW3 equivalent of helicopters on the battlefield. Again, they are not planning aircraft you can directly drive like tanks. The devs feel like adding full blown aircraft will be detrimental to the feel of the game.