A leaked Android 2.3.5 Gingerbread build has made its way online for the Samsung Infuse 4G and Galaxy S 4G on AT&T and T-Mobile respectively. When a build this good leaks online, it’s not usually too long afterwards until something official is made available.
In this case, however, there’s no need to wait. So long as you are rooted, follow the link below to download the necessary files. As always, if you’re uncomfortable with tinkering, it’s definitely best to hold out for AT&T to dish up an official software update.