Slade Wilson is making his big return in Season 3 of [Arrow](series:720988) next week. We don't know what he will do, or where he will be, it will most likely be on Lian Yu though.
Ever since last week, a lot of people have speculated about if Malcolm will take Oliver back to the island, where Slade might help them. The producers haven't said much about what had happened.
This is what Marc Guggenheim said this about it earlier today: " It feels like a coda to season two. It’s not just the final battle, but the final interactions between Oliver and Slade that we didn’t have the screen time to do at the end of season 2 because you’re racing to the end of the season. It’s nice to be able to write a little bit of an epilogue for these two characters. It’s not to say it’s the last time we’ll ever see Slade again, but certainly the story of Oliver versus Slade, the revenge for Shado’s death, that’s the kind of stuff this puts a nice capstone on. When we see Slade again, he’ll be in a different headspace. We’ll take his character in a new and different direction."
We have no official description of Episode 14 yet, but it says we will probably see him again, so he most likely will not be killed by Malcolm. Even though this is really unlikely, there can be a possibility of Slade forming a uneasy alliance with Oliver, not unlike Batman and Slade and the rest of the Injustice League in the arc Forever Evil.