Apple CEO Tim Cook will be the opening night speaker at the 11th D: All Things Digital conference next month. Last year, Cook joined hosts Kara Swisher and Walt Mossberg for a 100-minute session that covered a wide variety of topics. There’s lots to talk about, from the explosive growth of the mobile market to intense competition from a range of rivals, most especially Google’s Android, as well as innovative offerings from Korea’s Samsung. It will also be interesting to talk about the changes at Apple under Cook’s leadership, who took over from the late co-founder and industry legend Steve Jobs, as well inquiring about what new produ