Samsung has just applied to trademark the words "Z Slide" with the EU's intellectual property office (EUIPO). Given the category this new potential product name falls into, it gives the profound impression of belonging to a device with a rollable or slide-out display. It may thus fuel rumors that the OEM is indeed nearly ready to launch just such a cutting-edge phablet.
https://www.notebookcheck.net/Samsung-trademarks-what-could-be-the-product-name-for-its-first-gen-rollable-phone.540671.0.html