This year again I'm going to present at the DOAG 2012 conference in November. Since it is a popular topic I decided to talk about "Cost-Based Optimizer Basics" there, too. According to the official schedule the presentation will take place on Thursday, the 22nd of November, "Raum 1" at 13:00.
Like last year, I'll also try to do some Unconference sessions in addition - if it is going to take place, which I don't know yet.
I'll post some updates as soon as I know more details.