That article actually has a lot about William. The last few paragraphs talk about his relationship with Kate. I'm not sure how true it is though
"What about Prince William, who he knows through a mutual friend, James Meade ('Meadey'), who went to Eton? Is his sense of humour as bad as his dad's? OLLY admits: 'I do tease him about his sense of humour. He's always dropping clangers — saying things that just aren't that funny, but are intended to be. Depending on who's with him, people will either laugh,' (sycophantically, I assume) 'or just look at him. 'We get on well because we have a lot in common. We share the same interests — especially shooting. He's the best shot, really good. And we both want to go into the Army."