They wont use any of our ideas for the main story thats for certain.
I would like these things to happen though:
Lyons Brotherhood vs Outcasts war.
Talon Company (Along with it's employer) taking part in the war for their own profit.
To "not" deal with "save the world" crap again.
For Ashur and The Pitt to at least be mentioned, or to see caravans from them in the game.
To hear more about Eerie Stretch and Ronto.
Explain who the Smuggles in PL were.
Enclave remnants trying to integrate into society. (No hidden Enclave bunker with it's remnants scoffing about.)
A raider tribe with looted Enclave stuff that is extremely dangerous.
References to Harold and Oasis.