Today in build 6.22 we changed how the Someday list works. In the past only tasks marked as someday appeared on this list. Projects marked as someday did not show on the list.
Starting with today's build projects now show up on the list along with individual tasks marked as someday. If a project is marked as someday and has actions inside of it, those actions do not show on the list.
For more information please see our blog post on the subject.
This was a change we made after noticing that the someday list was getting overly crowded and that it was difficult to find someday projects in the main view. Let us know what you think!