3 to 4 times more profitable.... right... I think YOU'RE trolling. So that's like mining today @ $3-4 a bitcoin at current rates. Who the hell would mine at the current difficulty level for $3-4? If you pay for power, you'd be lucky to make more than a couple of dollars a day.... I call BS.
I don't think he was lying... look at the P/D ratio back in April: http://forum.bitcoin.org/?topic=7427.0
it was below one while right now it's about 2.5.
Also, I'd say 50-55% difficulty increase on or slightly before June 16. No idea about P/D though, anyone care to guess?