Yes, early in the movie the jedi (Yoda, Mace Windu, Plo Koon, Ki-Adi Mundi) talk with Palpatine and then with Padmé about Dooku. He´s known as the leader of the separatists.
Even if the war has not started yet, they are involved in negociations with the separatist confederacy. What Obi Wan sees in Geonosis it´s just the final stablishment of the CIS.
"Revenge is never a straight line. It's a forest. And like a forest it's easy to lose your way to get lost When engaged in combat, the vanquishing of thine enemy can be the warrior's only concern. This is the first and cardinal rule of combat. Suppress all human emotion and compassion. Kill whoever stands in thy way, even if that be Lord God, or Buddha himself..."