[Update:] The PC system requirements have been updated, you can find the up-to-date version here.
We've recently got the news on what exactly will be in the collectors edition, we also know that Dark Souls 3 will be coming April 12 and now, finally, we have the full set of information as the system requirements have been released.
While I can't give you the information on the mental endurance you'll need in order to beat Dark Souls 3 I can at the very least show you what you'll need from a technical standpoint:
"The Hollow" specs (minimum requirements):
OS: Windows 7 SP1 64bit, Windows 8.1 64bit Windows 10 64bit
Processor: AMD® A8 3870 3,6 Ghz or Intel® Core ™ i3 2100 3.1Ghz
Graphics: NVIDIA® GeForce GTX 465 / ATI Radeon TM HD 6870
Memory: 8 GB RAM
DirectX: Version 11
Network: Broadband Internet connection
Storage: 50 GB available space
Sound Card: DirectX 11 sound device
"The Chosen Undead" specs (recommended requiremenets)
OS: Windows 7 SP1 64bit, Windows 8.1 64bit Windows 10 64bit
Processor: AMD® FX 8150 3.6 GHz or Intel® Core™ i7 2600 3.4 GHzMemory: 8 GB RAM
Graphics: NVIDIA® GeForce® GTX 750, ATI Radeon™ HD 7850
DirectX: Version 11
Network: Broadband Internet connection
Storage: 50 GB available space
Sound Card:DirectX 11 sound device
As I mentioned above, Dark Souls 3 will be coming to us on the 12th of April 2016 so you have plenty of time to upgrade your rig before its released. And if you haven't heard, I'm afraid I have some bittersweet news because Dark Souls 3 is going to be the last game in the Souls series as From Software is ready to move on to different projects.
But don't worry, they still plan to design their games with the same principles in mind so whatever comes next, I'm sure it'll be good.