Some minor clarifications:
I presume this because of the description of the spell, which I partially quote below:
We are assuming that while in concealment, you succesfully hid, thus, granting you total concealment.You need total concealment to avoid AoOs. Normal concealment won't cut it.
MerakSpielman refers to the presumption of having concealment closer than 5 feet.I disagree. I see no reason to presume this
I presume this because of the description of the spell, which I partially quote below:
This would imply that OM does not obscure all sight/darkvision closer than 5 feet.The vapor obscures all sight, including darkvision, beyond 5 feet. A creature 5 feet away has concealment...