Thats what happened to us today.
Queued 3s, joined, been waiting, gates opened, all of us dced.
Searched enemies Paladin at the armory, prot specced, blue geared.
DK and Rogue hat unwritable names but are now visible in the team too.
Full PvE 363~ Combat Rogue, 371 PvP geared Frost DK.
They went from zero to 2250 within 2 hours and it seems they lost every second game regularly.
There also was an RBG Group full of blue geared alts with 300-0 stats etc.
Wintrading was so yesterday lol.
e: