The Playstation blog has a post on their upcoming Neocom App for the Playstation Vita. According to the blog post,
“You can interact with battles, purchase items on the market, play around with your dropsuit or vehicle and then save it so you can use it on PS3.”
I've been looking for MMO companion apps for quite some time and we should all expect this sort of functionality to be the norm in the future.
via Playstation Blog