Quote Originally Posted by Illrenmazou
Raphael: I really hope those things on the shoulders are parts to form another MS. It better have those obscure equipments like extra arms. It's not a Tieria Erde Gundam without those!
I'm pretty sure that they are armor parts. It looks to me like they are (in S1 therms) a Nadleeh to Virtue conversion. So instead of purging armor, it actually attaches to it.
If you look closely at the backpack, you can make out a front skirt and sideskirts and probable bigass arms. Maybe on the backside there is a backskirt and maybe even a chest armor thingie.