Vehicles are planned to appear in the game during this year. We already tested transport vehicles, you can see it in this video:
We can't confirm the Android version, however, we already tested the game on mobile devices. So everything is possible.
We will see if the weapon customization will be added, thank you for your suggestion. Also, feel free to download Last Mortem from Steam!
https://store.steampowered.com/app/1387510/Last_Mortem/