That was fast. Despite the fact that the Galaxy S5 won't be released for another two weeks, well-known developer and modder Chainfire has already rooted the phone. Well, at least one of the Galaxy S5s (S Fives? Galaxies S5? whatever), specifically the SM-G900F model, which seems to be the international GSM-LTE version. The root method will probably work with at least some regional and carrier variants.

To get root privileges, check out this XDA-Developers post for Chainfire's latest version of the CF-Auto-Root tool, flashable via a PC with Samsung's ODIN tool. At the moment it flashes a temporary modified recovery, then installs the SuperSU app, then re-flashes the stock recovery. The instructions are pretty simple, and should be easy enough to follow for anyone who's had experience with modifying Samsung's Android hardware before. Since CF-Auto-Root uses a modified recovery, it may not work with Galaxy S5 models made for carriers who habitually lock bootloaders and otherwise try to discourage aftermarket mods, like Verizon and AT&T. We'll see when the phone actually gets released.

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In related news, the Play Store version of the SuperSU app has been updated, presumably to the same build included in the updated CF-Auto-Root. According to the changelog for version 1.94, it also fixes force close issues for some Galaxy Note 2 models. Again, this may or may not need further work to be compatible with the myriad versions of the Galaxy S5 that will be available on April 11th.

Source: XDA-Developers via Chainfire (Google+)