To a Hammer, everything else is a nail.

He probably has the Hyperspeed augment for Thunder: increased distance = increased damage. 

Only the Wasp hull has the nuclear device as an overdrive.
When your overdrive icon is at 100% you may activate the nuclear device by hitting your [SHIFT] key.
For more information on Wasp's overdrive, see: https://en.tankiwiki.com/Overdrive
 

EMP removes your active supplies if you have them on. STUN freezes your tank for a few seconds - you cannot move or shoot.
 
If you are in full supplies and a nearby enemy Hunter and he activates his overdrive:
EMP Immunity = you are stunned in place, but your drugs are still active. 
STUN Immunity = your supplies are deactivated, but you can still maneuver/run.

They are out already. You need to look in your garage and you will see the hull augmentation icons. Click on them to open up the augmentation menus. They are available for 4990 Tankcoins each. The turret augmentations vary in price, but they can be bought for crystals.

Legacy items are there. If you do not have a lot of the skins, it will take a longer time for it to come around again.

Currently Tanki has scheduled maintainence starting from reboot up to a minimum of 3 hours. (See details)