Here's more, if we could have a "commander" or something, "groups" could work as squads then and orders could be issued through predefined sets. And I don't think things should follow up with the rest of MMOGs, specially for the options of a game clearly focused on PvP and on its natural flaws.
"Form a Phalanx! Raise your Shields" - Boosts Defense for the whole group, but reduces mobility and can only attack if attacked first
"Move into Wedge formation" - This one is good for offense, specially for fast characters, not sure what penalty should come from it
"Move into line formation" - Default for archers
"Charge!" - Boosts significantly attack power of the group, but reduces their defense significantly as well
"Scatter" - Good when stones are raining from catapults or when area effect damage spells are being used against your group, as they are more effective against tightly formed groupings.
"Be discrete" - Everyone on "stealth mode", useful for some situations
Of course whether everyone would obey or not, that would rely on the group cohesion and on the relations between them, perhaps a message "x issue an order of y, will you obey it?" could come, or something less invasive perhaps. But... I think I've been playing too many RTSes

Anyway it would be great to see such tactical stuff implemented, even if Soon
tm