Mass Effect 2 and Dragon Age: Origins at GamesCom

According to a couple of Twitter updates by BioWare's Matt Atwood (here and here), both Mass Effect 2 and Dragon Age: Origins will be playable at this week's GamesCom and will be featured at EA's press conference tomorrow.
Teams just headed out to Gamescom in Germany. ME2 and DA hands on gonna happen. Both are looking sweet! Keep an eye out - Matwood

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EA's press conference happening on Aug 18 at 4:30pm in Cologne, Germany. All of our games will be featured - Matwood