In the Dreams of Peace, Acts of War mission "Defend Portal Corporation" the Assault Portals seem to have been supercharged, spawning many more enemies than the last time I attempted a few weeks ago. Portals seem to spawn more enemies either constantly over time or in bursts when the player dies, and in my first attempt (before resetting the mission and just rushing and destroying all the portals as quickly as possible ignoring everything else) one portal spawned upwards of 50 enemies (most of which were bosses). This first try was done at +0 level, 1 player, EB instead of AV, and no bosses settings (assault portals seem to ignore the no bosses setting). When I did this mission a few weeks ago, the portals did spawn enemies, however they seemed to cap out at around 3 for these same settings, rather than the small armies that I got today (which spawned 5 - 6 immediately, and continued spawning seemingly until the portals were destroyed).
