Here is an insteresting question I have been thinking about recently.
I wonder if anyone has signed up for Heal & DPS or Tank & DPS, well, normally you are guaranteed to get either the Tank or Healer role but I wonder if anyone has gotten the DPS role in this situation. Would seem highly unlikely, unless you happen to be selected when a DPS left a group in progress.
Another thought occured to me: I wonder if anyone queing as pure DPS has gotten a group in 3 seconds, while somone queing as Tank or Healer had to wait 10 minutes...