I don't know but I had a feeling that a large patch would mean balance updates as well. I seriously doubt that wallpapers alone would be worth 400mb. Even though I still haven't gotten my Arios (FML), the buff on V2B and Sazabi is more than enough for me.
I think I heard somewhere that we got some other stuff as well. I'm not so sure what though. New interface and some other stuff is obvious, but I dunno 'bout the rest.
Woo, hooray V2B players!
爆ぜろリアル！ 弾けろシナプス！ BANISHMENT THIS WORLD!
00 Raiser, 00 7S/G, V2AB, Infinite Justice, HWS v, Master Fuunsaiki, God Fuunsaiki, SR Sazabi, Crossbone X1 Kai, X2 Kai, Harute (Final Mission Type) Stargazer, Crossbone X3, Sazabi
Upcoming projects: Arios Ascalon (100% Complete!), Crossbone X1 Skullheart (100% Complete!)
Playing Phantasy Star Online 2
IGN - ホモゲーバスター