The current "storylines" for Warhammer don't so much influence the future of the Warhammer line, but what cards are going to see print in the lcg. Just like the storylines for Game of Thrones don't influence Martin's books, just which cards are printed, and which houses/factions have access to them.
Valar Dohickey: All Men Must Have Gadgets.
In the East Central Minnesota area? www.gamersden.net
Yup, the only way they'll have players really be able to affect a story is if they use an IP they own or create. It would be cool though, it's the thing I like 3rd best about L5R.
there is also the concept of GW not allowing ANY fiction being written that isn't theirs... so those little stories and story arcs they have in CoC will NOT work for W:I as GW probably WILL NOT allow any literature to be written and sold in another product.