Same issure here. Except for me Indesign and Photoshop synced just fine from CC to CC 2014. Illustrator will not sync no matter what I do.
If you're trying to migrate your workspaces and other settings from a previous version of InDesign (CS6 or CC) to CC 2014, and if they don't migrate automatically, choose Edit > Migrate Previous Local Settings.
Syncing settings is a different process: This only syncs settings between two computers which have the same Adobe ID, and for workspaces, only syncs previously created custom workspaces.
Edit > Migrate Previous Local Settings is not available in Illustrator.
That's correct. However, you're posting this in the InDesign forum, and assume that that what you're asking about here.
Illustrator has no feature to migrate features from a previous version, now InDesign CC 2014 does.