When using VisualEditor currently when creating a page, the "Save page" dialog box has two checkboxes below the edit summary input: "This is a minor edit" and "Watch this page".
The "Watch this page" checkbox is not auto-checked, even though it is (for my account) via the non-VisualEditor editor. There's a user preference ("Add pages I create and files I upload to my watchlist") that controls whether this checkbox is checked by default when creating a page. VisualEditor currently ignores the value of this user preference. It should respect it.