There are patch notes on the Bethesda.net Forums outlining changes in a new version 1.5.4 update for the Fallout 4 Creation Kit 1.5.4 that aids in the development of mods for Fallout 4. Responding to a rash of problems with PC mods being ripped off with no author's credit when uploaded for consoles, Bethesda now requires PS4 owners to have a linked Steam account before they can upload mods for the PS4 edition of the RPG sequel (thanks Polygon). Here's word:

In preparation for the upcoming PS4 private mod beta, PS4 Mod support is now available with the latest Creation Kit Update. Modders, please update to the latest Creation Kit to start uploading your mods for PS4.

NEW FEATURES AND FIXES

• Uploading mods to Bethesda.net requires Fallout 4 ownership via a Steam-linked Bethesda.net account
• To link your Bethesda.net account, start Fallout 4, select Mods, and log in. This automatically links your Bethesda.net account to your Steam ID.
• General optimizations and bug fixes

KNOWN ISSUES WITH PS4 MODS

• PC textures are used. Memory and performance issues may occur. We are working with Sony on optimal texture exporting support in a future update.
• Sound files are currently not supported. PS4 sound format is a proprietary format. We are working with Sony on sound file processing support in a future update.
• PS4 Mod Storage limit is approximately 900 MB at present. Please do not upload mods larger than 900 MB. We are working with Sony to increase this limit.

The Closed Beta for PS4 Mods is close to ready. Stay tuned here and follow us at @bethesdastudios for updates. Note: Modders who have uploaded a PS4 mod to Bethesda.net will be invited to the PS4 Mods Closed Beta forums to help with testing.