Valve to release Half Life 3 and not Half Life 2 episode 3 becuase the waiting period for an episode into the series to wrap it up is not enough. Simply Half Life 3, full blown sequal to Half Life 2 an complete epic masterpiece in gaming and source engine 2 or something advance tech they cooking up.
Oh did i say PC limited exclusive until new consoles so it can support the new tech.
Of Course That's Just My Opinion, I Could Be Wrong