Bethesda has revealed system requirements for Wolfenstein: The Old Blood. Much like The New Order, you likely will not need to upgrade your PC at all.
CPU: Intel Core i5-2500 or AMD FX-8320
Video: Nvidia GeForce GTX 560 or AMD Radeon 6870 with 1GB VRAM
CPU: Intel Core i7 or AMD FX-8350
Video: Nvidia GeForce GTX 660 or AMD Radeon R9 280 with 3GB VRAM