Seems like a new mech assault doctrine but with this you never need to tech out of T1. Heavy T1 with Shrek Grens + STUG e's + Hetzer seems like a very solid army.
Given that it calls the Hetzer a light tank destroyer (which I know it is, but relic didn't need to inculude this in the description), I have a feeling that it will be a glass cannon kind of thing instead of the armored beast we got with PE. Probably medium armored front, light armored back, low hp pool but high penetration and range.
Who knows though, and who knows if this doctrine will even make it? Could be cool, any sort of new gameplay is good so w/e I'll fuck with it. Especially if it is free somehow.
