Those interested in finding out how the new WAR tanks play won't have to wait until the end of the Heavy Metal event. The new patch is on the test server right now and this includes the 2 new tanks coming out next month. I got an email this morning welcoming me to the exclusive public test and the public test forums. So participation might be limited to those who had previously bothered to copy and log onto the test servers before today.
I only had a little time to level up the 2 new classes to level 2 before work today. I noticed the Black Guard didn't seem to get an Oath-Friend ability at the start like the IB did. And along with the similar strike that improved your toughness, the Black Guard also got a unique strike that reduced the enemy's toughness at level 2. I wish I could comment on the KoTBS but having never played a Chosen, I didn't have anything to compare it to.