I'll just throw it out there that I'm personally not expecting episode 3. At this rate, I think Valve has realized that they can't keep up with what an episode was supposed to be (more frequent), and with the updates to the source engine (Portal 2 looks much better than even Lost Coast, in my opinion), its probably in Valve's best interest to go all in and make the next Half Life installment Half Life 3.
That's just my opinion, and its not related to the leaked art, so feel free to glance over it.
That's just my opinion, and its not related to the leaked art, so feel free to glance over it.