Apple chief Steve Jobs may present at this year's D8 conference, a rumor this afternoon suggests. The executive has "tentatively" agreed to answer questions at the Rancho Palos Verdes-based event and, if so, would be at the same event as Microsoft's Steve Ballmer as well as Facebook's Mark Zuckerberg and other tech luminaries. Kara Swisher, who usually co-hosts the show with Walt Mossberg, would only say to SAI that Jobs had been invited.