so according to the Oct 5 announcement accessories only come from iron lockboxes and trading which i don't mind much; however as the title says it would be nice to have accessories as possible prizes in pvp modes. whether iron lockbox or accessories are featured as possible prizes or special accessories themed from pvp modes like lockdown that is up to OOO (personally a King Kromo brand lockbox/ key set would be awesome)
as a side note: why no accessories for shields?
You beat me to it!
I'd assume they would use the same lockboxes though, and only put in lockboxes, no keys or opened things.