News Release: http://services.runescape.com/m=news/newsitem.ws?id=2837

It’s out! The new skill is here and it’s available on free-to-play! You’ll receive all the equipment you need to train the skill when you arrive, so catch a boat to Daemonheim from behind the Al Kharid bank to start your new adventures!

Within each dungeon, the adventuring party is asked to solve puzzles and fight monsters, while using their skills to overcome the fiendish challenges that stand in their way. Use your skills to equip your party members, search for loot and keys and explore the floor until you find the epic boss monster at the end.

The environment contains hundreds of new objects, NPCs, rooms and locations covering an area more than 60 times the size of Falador – more than any single update ever has!

After adventuring (with a group of up to 4 other players), you’ll be able to access a wealth of new skill upgrades and reward items, including new weapons and armour for both the free and members’ game.

Details: http://www.runescape.com/l=0/kbase/guid/dungeoneering

It'll be interesting to see how this plays out.