Yeah, they said that they'd remove it as a standard game mode and instead focus on using it as a special event every now and then. I think they took it away last month, but I'm not 100% sure.
I think it's a good change, but I'm slightly annoyed because my baby account has a "Complete Incursions zones with a friend" objective that I can't complete.
incursions also are (allegedly) a source of points for the Weekly Alliance Event.
Dr. Zola