Although Incognito has not officially announced a UK release date for Warhawk, many UK retailers are listing a provisional release date of September 14th 2007. It is likely that the game will not launch globally on August 28th 2007 as promised by Incognito, although this is also unconfirmed. The game has gone "gold" and will definitely launch in North America later this month. Warhawk will be available as a download from the PlayStation Network Store and from local retailers.
Until the release date for UK is confirmed by SCEE, this article falls under the rumor category. Look out for more information soon.