This is really a rumor but Kryptonsite says...
"Sam Witwer's character of Davis Bloome was killed in the Season 8 finale, "Doomsday," but a lot of fans had hoped that he would continue with the series as the character of Zod when the show returns for a ninth season".
"Unfortunately, it's looking more and more like Sam-as-Zod is not going to come to pass. A few independent but unconfirmed sources are telling us it's not going to happen, but of course, this hasn't been confirmed or denied by the network or the series' producers".
Well, I don't think that this is good. Sam/Zod was in the last scene of season 8.