It was Inevitable the stock would dip a little when Jobs announced he was stepping down. Considering he's still going to be the driving the force of the company as chairman of the board pretty much tells you all you need to know.

Secondly, he wouldn't hand pick someone who didn't share his vision. Cook is smart, he's not going to drastically change the course of the company like some other cough HP cough companies have done.

Considering these two things, I'd say the stock prices will stay the same if not continue to increase in value.