Surf Shack Gaming has released rules for their 28mm Rugby Union Miniatures game.
From their website:
Two years in the making ... Honed while watching the World Cup action in NZ. Flying Tackles brings the hard, furious action of Rugby Union to your table top. Play in 28mm on a 4'x3' or in 10/15mm on a 48cm x 32cm pitch.
Games last 80 -100 minutes and include all aspects of the game (including dirty play).