I heard these news in 2008 december, BTW I tell you:
“Speaking in an interview with Kikizo, Doug Lombardi revealed that the >next time you play as Gordon will be longer than the distance between HL2 to Ep1, and Ep1 to Ep2.<”
For the record, the gap between Half-Life 2 (November 16, 2004) and Episode One (June 1, 2006) was around 19 months, while the gap between Episode One and Episode Two (October 10, 2007) was slightly longer than 17 months