I should probably know the answer to this, but I will ask. First question, if I bought Arkham Knight Premium or Far Cry 4 Complete, and I already had progress saved playing the normal editions, would it just add what I don't have (like DLC's) and keep everything else the same? Would it need to re-download/install the game (the new version)? Or if I deleted the original version's application from my storage space, it wouldn't save my progress? This might help me know what to do under the scenario I need to download and I don't have room on my Ps4.
Also, semi related, if you download games like digital, dlc, etc., is that linked to the PSN account or the Playstation system? My gut is telling me it is linked to the PSN account but I want to be sure. I'm assuming the progress of disc games don't carry to a new Ps4 unless the progress is stored in a cloud or something but I doubt it works like that. I'm guessing to transfer that over, you would need to copy it onto a hard drive and do it manually.
Reason I'm asking is because I'm running out of space and considering the possibility of how I could transfer all of my stuff to a new Ps4 seamlessly. I also have an old version of the Ps4 and wouldn't mind the new version. Mine works absolutely fine too, no problems other than the lack of space. So maybe it won't even be worth it if the upgrade is too much or too difficult.
Also, it is weird because people sell Ps4's with digital games included, so I'm assuming they are letting people play under their account?
Bonus question while I'm at it: What is the best Ps4 headset for around 30 bucks or less. I found some that look good but I suppose I will ask recommendations from your personal experience.