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)
NEW FEATURES
- Skyrim launcher support for Steam Workshop (PC)
[...]
