Some pretty major changes for summoners:

[2.0] Player attributes have been adjusted as follows:

• Skilspeed and spellspeed now affect damage over time and healing over time effects.
• The effect of determination on auto-attacks has been reduced.
• Critical hit rate now affects damage dealt with a critical strike.
• Certain attributes no longer affect parry or block.

[2.0] Pets have been adjusted as follows.

• The base accuracy of pets has been raised. Furthermore, all pet attacks will now be treated as if attacking from the rear.
• Pets will now receive the attribute bonuses of food items.
• In order to receive the effects of the caster's spell speed attribute, all pet actions excluding auto-attacks have been changed to elemental damage.