RuneScape Lead Designer Mod Mark has written a new "Behind the Scenes" article for May, and it covers a variety of updates to the game. Here's his summary:

"Go with the flow in May with flowing capes of distinction and mining at the Lava Flow Mine; then behold players 'walking tall' with hats that morph depending on your Wilderness and Duel Arena kills, and hear even taller tales in the form of the Fremennik Sagas. Finally, round off May with some general upgrades taken from player suggestions on the forums."