As far as I know, not yet.
There are 4-5 new levels published per week, and you should get an email whenever that happens (unless you disabled that). Check your settings.
Of course I can only guess, but a RSS-Feed seems a little to much just for the information that every Wednesday new levels are published. This is for the CC-Team to decide.
Some levels are listed in When do I get which Item, though the list is currently outdated for the mountain-area.
Is there any special reason you need this? I can send you some pictures (screenshots) of the level-lists. A text-list is currently out of my available scope, as I’m pretty busy with my work.