I have tried to look up this answer and have found the "HELP: I cannont access my expansion content on my Playstation System" topic but still not sure on how the region restrictions work with DLC/downloading future DLC.
So i have a US PSN account, bought the original physical Destiny game here in the US and all the DLC bought through my US PSN. I am now moving to Canada for a year due to traveling for my work but I had a question if I will run into DLC not working when I am over there? Will this also effect if I download DLC that might come out later (free updates similar to the April update/the dawning)? I don't plan on using another PSN account while over there. Thanks!
I don't think you will have any issues as long as you are using the same game disc (or disc of the same region as you have now) and the same PSN ID. DLC region is determined by the region setting of the PSN ID that made the purchase.
Full disclosure: I don't have a playstation, so I would suggest contacting PSN support for a more definitive answer. The platform vendors (Sony and Microsoft) manage digital purchases and region restrictions, if any.