With a one-word post and a concept art pic, Valve have revealed their surprise - Half-Life 2 Death Match.
Added:
Half-Life 2 Death Match is now available through a Steam update; the SDK has also been released and an official HL2 Death Match map contest has been announced by Valve. Check here for details
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Halflife2.net: A preview of things to come
Valve Update HL2, Surprise on the Way (25 Nov)
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