For those Harry Potter fans out there, you can consider this the "Parseltongue" upgrade.
The second stretch goal for the Astagar Kickstarter effort is unlocked, and now every Heavy Infantry pledge now has an additional Viperia armor in its midst, capable of coordinating fire support and clearing the airwaves of enemy jamming.
Next stop (and rapid approaching, btw), the Astagar MBTs will be unlocked.
When that happens, you'll see some serious damage unleashed.
Seriously. Those things are so huge and mean, it's scary.