Clan Cup is coming to osrs with registeration opening on the 28th, Jagex's latest dev blog has more details:
http://services.runescape.com/m=forum/forums.ws?317,318,890,65158590,goto,1
Who's entering?
http://services.runescape.com/m=forum/forums.ws?317,318,890,65158590,goto,1
Quote
PvP is a big part of the many reasons that players come to play Old School. We are fortunate enough to have a very active and large PvP community and we want to be able to celebrate this by holding a PvP competition. During the Clan Cup clans will be battling through knock out tournaments to decide who are the best PvPers in Old School? On the 28th September we want to open registration for a Clan Cup and would like your feedback prior to this.
Who's entering?