So here are all the abundant DLC hints in the game people seem to have found so far:
- A map Nav point called "North Passage" on the North (natch) side of the map that appears to be a cave, but it is currently blocked by boulders. In all likelihood this will be the site of the first DLC, probably New Canaan related.
- A tunnel with a locked door on the West side of the map, with no apparent key existing.
- Antony in the Legion Camp indicates that Denver / Dog City is canon.
- In the Legion Camp there is a map on a table that charts a bunch of territory East of the Colorado.
- The Boomers mention an "Area 2" to the East of the map that contains many weapons.
- If you complete Veronica's quest and reach a certain point in the Brotherhood questline, she says that Elijah, the AWOL former elder who was nearing some sort of breakthrough at HELIOS One before it was taken by the NCR, is still alive and has sent her a message indicating an intent on his part to "cleanse the wastes" so that the BoS can rule them. Sounds
awfully familiar.