The method is the same as any other previous issues of the OS X from Lion onward, involving the extraction on the InstallESD.dmg file from the package and copying to an external bootable drive. Apple hasn't changed the install file to my knowledge.
NO!
It is totally different in mavericks.
I won't bore you with the tortuous details of the change starting with DP1 (involving manipulating invisible files and other such shenanigans) . But one consequence of that was that apple then made a new createinstallmedia executable file made for precisely this purpose in DP4 without such shenanigans.
The method for the GM is very similar to DP4, but with slightly different file names:
After formatting an 8GB USB as Mac OS Extended (Journaled) and naming it Untitled, run this in terminal:
sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Mavericks.app --nointeraction
Be patient. It takes quite a while to complete.
But once it does, you can boot up from it by holding the option key down whilst booting.
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