An HD ST-I was spotted at the WG Live interview on the WoT NA Facebook page including an XM551 remodeled with extra decorations and a new extended spaced armor cage for further protection. Thanks goes to 2goxd and CounterMAN for pointing it out and apologies for taking a while to post it.
HD ST-I
http://i.imgur.com/kd6ojC3.jpg
Remodeled XM551
http://i.imgur.com/Bsv37oH.jpg