Google Chrome OS' local file system

I was curious about the file system of the upcoming Google Chrome OS. As I haven't found this info anywhere on the chromium.org site (ok, Chrome OS was released only just 30min ago :). So I've pulled the source and scrolled through... In the source tree I've found ext2* and ext3* files that indicate that it uses either ext3 only because the ext3 file system is basically the journaled version of ext2 or it uses both ext3 (for local storage) and ext2 (for the static parts). However there were no ext4 files. For those of you not familiar with Linux — all these are Linux file systems.

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