I don't think the spawns have ever been changed for regular seekers. Soldiers and gjall spawn more infrequently since the first balance patch. Seeker spawns are limited to pairs during the day and one-star levels. During the night as many as 6 can spawn with full level range. Don't go out during the night.

Gjall had some of their blunt damage changed to fire damage. They are less destructive to stone and marble buildings.