Facebook, Twitter, Forums, Email, and inspiration from movies and books are where they get some of their ideas. If Bethesda has some location for us to submit our ideas, then it would be on the official webpage.
They don't actually pull ideas wholesale from suggestion threads or anything like that, they mostly just keep an eye on the community to see what kinds of issues they can address with DLC or patches. Like when they opened up the ending to Fallout 3 with Broken Steel, or improved vampirism and lycanthropy in Skyrim with Dawnguard.
But we don't really know for sure. Sometimes someone makes a thread asking where all of the devs are and why they don't post here on the forums, and every now and then a dev does post to say that they are listening.
here is the DLC for you
1- Underwater/Ship of the coast location
2- Vbird drop off on a new area not on the map
3- Teleport to a new area off the map
4- Underground location- possibly under the glowing sea
MARK MY WORD it will happen
also- Fallout 5 will be based in the West Coast as it should be. You read it here first
Oh, those are just automated responses. If a post contains the words 'suggestion', 'idea', 'you know what would be cool?' or 'I want to go to Akavir!' there's a random chance of the forum software posting a "dev's" reply.
I want something Enclave related....
They didn't put the X-01 armor in the game for nothing.
Hope we do get Enclave related dlc
BTW, how great were those Fallout 3 dlc trailers. I still look at them to this day. The point lookout trailer was amazing!
I'm sure a lot of Bethesda devs are in close, well, not contact but they do observe the various Fallout and TES communities around the web. Gstaff's whole job is to interact with us, and I am sure that places like r/Fallout are also being looked at to find feedback that they can incorporate into the DLCs and the next game.
There's one thing that I heard in the run up to Fallout 4 being released though, and im not exactly sure where I heard it from. Bethesda looks at ideas in practice, not in theory. Someone could write a giant outline of what they want Fallout 5 to be, and unless that stuff has been tried and tested in a actual game its unlikely to be considered. A lot of the new things in Fallout 4 are based on things from other games, things that have been known to work, or at the very least are well received enough that they are worthy being tested out in Fallout 4. Im sure for every system we see that is inspired by other games in Fallout 4, there's a whole bundle of other systems that were prototyped but eventually dropped. Fallout and TES have some of the longest development cycles in the industry, and I think I am right in saying that there is a lot of things that were tried out in Fallout 4 that never made it to the final release.
I wonder if their be making the DLC in their new http://www.pcgamer.com/bethesda-opens-new-montreal-studio/?utm_source=facebook&utm_medium=social&utm_campaign=pcgfb
I want something chinese related, even if it was already done. Im just a big svcker for their weapons and army uniforms, freaking cool stuff. Also, underwater exploration/city is going to happen, there is a lot of hints throughout the fallout 4.
Don't worry I already suggested they should make some horse armour DLC!
(no I'm never going to let that die)
Since Boston and New York are big baseball rivals, maybe a DLC will involve travel to NYC like they did with the Pitt DLC. That being said, NYC could be where Fallout 5 takes place.