It's been mentioned that it's PlayerParty vs. MOBParty, by the devs. That'd explain the circle.
I'm more in line with this kind of thinking. The circle probably gives a hint to a new fighting structure rather than the front line / back line mechanics that we are more commonly used to. This combined with an adjustment to smaller group play could be a welcome combat mechanism.
When they said about a secret meaning and to look carefully, the interviewer basically said "So what's the secret?" And they said something like weapons playing a big part, and all of the adventurers relying on their weapons (Hence facing out) and relying on the other adventurers to have their back (hence backs to each other). Seems like its kind of a circle of outward facing players, supporting each other.
My thinking is in line with these two ideas. Possibly this would allow every "job
" to "engage
" in combat with his/her weapon, while specific weaponry skill may offer specific job abilities to aid the party while in said battles.
"Many vs Many" battles means EVERYONE draws their weapons and fights, yet every person may have something different to bring to the "party" depending on what they are fighting with.
One can only speculate; but at any rate, SE has gotten my attention with this baby!