Dell and HP have already announced the 2018-generation of their mobile workstation laptops. The third of the "big three" PC manufacturers, Lenovo, has not announced any new models of the ThinkPad P series. Today, the first pictures and specs of the upcoming Lenovo ThinkPad P52 have been leaked.
https://www.notebookcheck.net/Lenovo-ThinkPad-P52-First-pictures-and-specs-of-the-new-Lenovo-workstations-have-been-leaked.307836.0.html
Another picture was added to the lenovoshop dot sk (can't post it here - low post count)