Valve have posted a simple message on their official forums that Day of Defeat: Source will be released as a standalone Steam purchase - purchasing HL2 will not be required to play, though DoD:Source will also be included in the Silver or Gold HL2 packs.
There is no mention of the retail version in the post:
You will be able to purchase DoD:Source through Steam without purchasing a new copy of HL2. Release date and pricing have not been set yet.
Original thread
Thanks to Greg for the link
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