season pass only includes dlc 1 and 2. Updates are separate from the dlc, you will get the updates even if you do not have the dlc, you will need the dlc for new content though. You have to read what the pass you are buying grants, there are some for forza that grant 5 car packs only, or fighting games that grant a couple new characters. ALL content is not included, that is why they are season passes not lifetime dlc passes.