the Kanonenjagdpanzer is now for sale in the NA and SEA server.
The NA one in particular makes part of the "Ancient Weapon Sale" and has this mission:
"Powering Up the Ancient Weapon"
- Must be driving Kanonenjagdpanzer
- Random battles only
- Not available on daily first-win bonus
- 4 times per day
- Deal at least 750 damage to enemy vehicles in a single battle, and win.
- x5 XP
Next and last "Ancient Weapon" will be coming on the 22 September.