It's a small thing, but it drives me to distraction. Behold:
Cavalry: Troops trained to fight mounted on horses (or perhaps bears. Or sharks!)
Calvary: A hill outside ancient Jerusalem where Jesus was crucified, also called Golgotha.
Notice the small, but all-important spelling difference in letters 3-6. Gamers seem to have no problem referring to cavalry as "cav" but only seem to be able to say "cavalry" about 50% of the time instead of saying "calvary." Cav-al-ry. Cal-va-ry. Not the same.
Also, when you say "supposably" you probably mean "supposedly." Supposably is a real word, but it means conceivably. So,GW is supposedly releasing a new Daemonhunters codex soon, but they are supposably releasing a new army made up of power-armored chihuahuas in 2011. Supposably.