It's canon that Lana Lang was Superwoman in both the Rebirth and Reborn continuity. However, she isn't currently Superwoman in the main universe as far as I know.
Is there any chance we'll see her again as Superwoman at some point? That's an open-ended question that doesn't necessarily mean she'd have to have her own book again (Though that would certainly qualify!)- I would also count an in-costume guest appearance in any DC Comics title like a team up with Superman for a issue or two, or even a small cameo like Superman walks into the Hall of Justice and passes her in her costume and says "Hi Lana. Good to see you back in the fight." as he walks by. You know, anything that clearly depicts her as a superhero in the present tense, large or small.
I wonder if that concept of her has been more or less permanently squashed, or if it's something that will pop up again eventually.