Edit: 7PM Eastern, 12 midnight GMT, 3PM Pacific.
Not much to say here, though. Um. Time for [spoiler]Trade Hatress 3.[/spoiler]
7PM tomorrow, I believe. Not sure about the timezone, but probably something American. Maybe Universal, it's Kotaku UK talking about it.
Per the US date system, it's 1/17. Halo-Life confirmed.
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He revealed there would be another game in the portal/half life universe