According to Valve founder Gabe Newell, Apple CEO Tim Cook never visited Valve's offices, despite recent rumors. In an interview with the Seven Day Cooldown podcast, Newell explained that Valve was perplexed as to where the rumor ever started.
"We actually, we all sent mail to each other, going, 'Who's Tim Cook meeting with? Is he meeting with you? I'm not meeting with Tim Cook.' So we're... it's one of those rumors that was stated so factually that we were actually confused," said Newell.
He did mention that Valve would love to see Apple support gaming a bit more.
"No one here was meeting with Tim Cook or with anybody at Apple that day. I wish we were! We have a long list of things we'd love to see Apple do to support games and gaming better. But no, we didn't meet with Tim Cook. He seems like a smart guy, but I've never actually met him."
So there's no secret Apple/Valve team-up happening in the near future. Shame.