Sadly, no, it will not. The “Skyrim launcher support for Steam Workshop” will be included, but it seems the Creation Kit will come a few days later, but still in January.
The Creation Kit and Steam Workshop are nearly ready. We’re currently working with members of Valve and our modding community to do some final testing, and we’re on track for a public release near the end of the month.
Current 1.4 Changelog (all platforms unless noted)
- Skyrim launcher support for Steam Workshop (PC)