I haven’t played the game, but I’m not allergic to spoilers so I basically know all and I don’t like the current ending / gameplay options. I hope DLC will either add or expand on current ones making them bearable to me.
Do you think it will go on sale again around the time they will release a DLC? Or should I buy now and wait?
Probably it will go on sale again.
And I’d like to remind you that, many of those Souls DLCs have some opaque ways to access them, and they are mostly only accessible halfway thru the game. So it might not be a bad decision to play it when the DLC is out, some of us might need to start the game all over again / NG+ just to access the DLC, who knows.