1.) What Vaults do you think should be in the next game?

2.) What follower ideas do you have?

3.) Any item ideas?

4.) New locations?

5.) New setting?

6.) Any returning NPCs you would like to see?

7.) Timeline?
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1.) I have a few ideas myself like a few vaults I saw that weren't in games I think would be interesting.

2.) I have ideas for a follower, maybe a few of them.

3.) I've come up with a few new weapons and maybe some new consumables

4.) I haven't come up with any new places I think the game should be in.

5.) I think it would be interesting to explore a Nuclear Winter theme this time around instead of the Nuclear Summer theme the wasteland normaly has.

6.) I think it would be interesting to see Rose from FNV, Arcade Gannon from FNV, and a few of Arcade Gannon's "family" from FNV.
They said they wanted to leave new vegas anyway.

7.) I think the next game would be interesting if it took place only about 5 years after the events of New Vegas.

http://www.gamesas.com/index.php?/topic/1175207-fallout-4-speculations-suggestions-and-ideas/ is what you're looking for.

It is indeed.

Please use the linked thread. Thanks.