Races have vanished on the tournament circuit. Bell of lost souls has reported Dark Angels, Sisters of battle and Black Templars we not represented at all at Feast of Blades. I haven’t played any of these codex in 6th Edition, but I expect this no show was more down to a lack of love from GW then the changes in rules having a negative affect on the army. You can read there full article here. http://www.belloflostsouls.net/2012/11/40k-army-meta-post-csm-edition.html