Given that SOE is making this game, and they make everquest, I will almost guarantee it will be the same as everquest.
looking at the screenshots and preview from internal beta they even use the same font and font colour and font size as they did for EverQuest (purple for tells - PMs, green for Guild - outift, blue for group - squad).
/tell name message
/outfit message
/squad message
peeps seem to think that MMORPG fans will be at a disadvantage cos this is an FPS - well no it aint, its an MMOFPS, an those with MMO experience will be at an advantage as this will not be a new experience to them. They will be used to full scale battles and following orders (if they where any good at the MMORPG hehe).
edit - had name in the /outfit bit