All summoned creatures will have their HD reduced by 2.Planar Spells now benefit from conjuration focus.
Summon I-IX now benefit from conjuration focus.
Swarm spells (conjure spiders, conjure metalman, etc) now benefit from conjuration focus.
Dead Walk now benefit from invocation focus.
Animate Dead and Army of the Dead now benefit from necromancy focus.
Create Undead and Create Greater Undead now benefits from necromancy focus.
Revenant Spell now benefits from conjuration focus.
Phantom Wolf and Bear now benefit from conjuration focus.
Airball now benefits from conjuration focus.
Summon Ibrandlin now benefits from conjuration focus.
Create Baneguard now benefits from necromancy focus.
In exchange they will now scale with spellfocus conjuration/necromancy or invocation focus.
Spellfocus: grants +1 HD.
Greater Spellfocus: grants +1 HD.
Epic Spellfocus: grants +2 HD.
Red Wizards who specialize in the proper spellschool get +1 HD.
So a character that used to summon a 16 HD creature with Greater Planar Binding will now summon a 14 HD creature. If he has Epic Spellfocus Conjuration he will summon a 18 HD creature.
Note: Summons are still subject for balancing and numbers might be tweaked.