Lombardi (who is Valve's marketing big-wig) says,
in this interview, that Half-Life does not end with Episode 3.
Quote:
Stuff We Like: Are there any current plans after Episode 3 to have a Half Life 3?
Dave L: We haven’t announced anything specific, but Half-Life won’t end at Episode Three – hang on to your crowbars!
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So obviously Episode 3 was imminent given how Epi 2 ended, but this seems to indicate we'll either get more HL2 installments, or as this site speculates, a full-blown Half-Life 3.
And it begins...