Tim Cook learned a lot from Steve Jobs, and one of the big takeaways seems to be: Don't tip your hand. The Apple CEO was unwilling to tackle questions about any future product plans during his first appearance on the D10 stage Wednesday night. Watch Tim Cook discuss Facebook relationship HERE: bit.ly Tim Cook gives Apple TV hints HERE: bit.ly Subscribe to WSJ Live HERE: bit.ly WSJ Live brings you original programming from The Wall Street Journal. Get news directly from The Wall Street Journal's 2000 reporters across the globe. With exclusive video and daily live programming, you can stay on top of the latest in news, elections, markets, tech, opinion and lifestlye.