MSFT.guy released iPhone 3GS iOS 4 pwnage tool bundle, means with a little workaround in pwnage tool you can update your already pwned iPhone 3GS to iOS 4 GM with jailbreak and unlock support. Procedure is very easy, you have to add two bundle files to the DevTeam’s pwnage tool for Mac, that will enable support for custom firmware 4 beta Creation. Need less to say iOS is still in GM build, final build is now less than two weeks away.
Note / Warning :

The bundles included in this release are ...

Source:Jailbreak iPhone 3GS iOS 4 GM with Pwnage Tool

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