Bethesda.net now offers a Fallout 4 release FAQ along with the minimum and recommended system requirements for Bethesda's upcoming RPG sequel. Word is the game requires 64-bit Windows and 8 GB of RAM. Here's a bit:

We’re almost there! In just over a month, the wait for Fallout 4 ends and you can finally explore its densely populated Wasteland on Xbox One, PlayStation 4, and PC. Until then, Vault-Tec was kind enough to provide us with some handy information to ready you for launch.

PC Systems Requirements (Requires Internet Connection and Free Steam Account to Activate)

Minimum
Windows 7/8/10 (64-bit OS required)
Intel Core i5-2300 2.8 GHz/AMD Phenom II X4 945 3.0 GHz or equivalent
8 GB RAM
30 GB free HDD space
NVIDIA GTX 550 Ti 2GB/AMD Radeon HD 7870 2GB or equivalent

Recommended
Windows 7/8/10 (64-bit OS required)
Intel Core i7 4790 3.6 GHz/AMD FX-9590 4.7 GHz or equivalent
8 GB RAM
30 GB free HDD space
NVIDIA GTX 780 3GB/AMD Radeon R9 290X 4GB or equivalent

Console Storage Space
Make sure you have enough space in the vault to store Fallout 4.
Fallout 4 requires 28-35 GB depending on territory and languages supported.

Release Time
Want to know exactly when you can start playing Fallout 4? Digitally the game will become available on November 10, 2015, at 12:01 am (local time) in all territories (In North America, the unlock time will be 12:01 am EST), except Asia (available at 12 am on Wednesday, November 11th) and Japan (available at 12 am on Thursday, December 17th).