On latest SoD PTR build, queing heroic strike will break the spell que window feature and make it fail to function.
For example, go to a target dummy, cast sunder armor, wait until its GCD is about 80% done and tap the hotkey once and it will cast the moment GCD is ready. If you do this with heroic strike qued, however, the spell will NOT que.
This was a bug in WotLK that was FIXED in Wotlk but its present in SoD still.