It was added on 10 December 2007.
Duel Arena:
We have opened the doors of the Duel Arena to free players, so that they can get a taste of intense one-on-one duelling. Staked and friendly duels will be available, with a number of options to choose from.
The stake restrictions that apply to members' duels also apply to free-to-play duels. The Duel Tournament area is still members' only, however.
The F2P Duel Arena is available on all worlds. Visit the Knowledge Base page for more information.
Additional bank space:
We have decided to increase the number of bank spaces that everyone has! Members will now find that they have 32 extra slots to fill with items bought from the Grand Exchange, future Summoning trinkets or any other use that can be found for them.
Free players have not been left out, either. Eight more slots have been made available, so enjoy filling your newly-expanded bank!
In other news...
Due to recent 'player stock' price changes in shops, we've introduced a feature to some 'notable' NPCs. Jiminua just north-west of Tai Bwo Wannai and Ordan at the Blast Furnace will un-note certain items for a small price. Jiminua will un-note pure essence and Ordan will un-note any ore that is sold in his shop.
The level 85 Teleblock spell has been replaced with the new Bounty Locate spell, available to use in the new Bounty Hunter minigame. This spell will teleport you close to your allocated target within the minigame area.
A bank pin has been added to the Grand Exchange to protect any expensive items you have for sale, or items you've successfully bought but not yet collected.
Free players can now purchase Wilderness capes, for all their Clan Wars needs. Visit the Knowledge Base for more information about how.