GP is set to return in May 2019, just in time for its 20th Anniversary. According to US_11, the 2019 retro of the Nike Zoom GP is slated to arrive at select retailers on April 20. Pricing has yet to be announced.
UPDATE (4/13): Official photos of the Nike Zoom GP Retro releasing on Apr.20 for $160 via Nike.
Nike Zoom GP
Release Date: 04/20/19
Color: White/Black-Cinder Orange-Lucid Green
Style #: AR4342-100
Price: $160
