They were already up to date, and I'd bet this only adds some formations to the existing PDF. (Those PDFs were one right move they made with AoS.)
Just seems odd... If they have the Lizardmen/Seraphon in the fluff and artwork using the techno-magic they should definitely have access to (and be using more than ever), then there's a weird disconnect between story and models. Otherwise, they have to hold them back from their full potential in the story. Not really ideal.
I'd love to see more techno-magic stuff. If you're going to just chuck out anything that might be construed as generic fantasy, why keep Lizardmen as Lizard-men riding dinosaurs with an Aztec them using Aztec weapons? Most of that is cool, but break out the lasers, the blasters, the lightning guns, more wild creations designed by the Old Ones to take on their enemies. Sigmar's got a bloody space station wrapped around a planetary core, there's no reason the guys who used to have warp gates can't have some crazy gadgets and gizmos.
Not meaning to "bash" them here, just feels like a lost - or seriously mistimed - opportunity.