Kuu, don't flame on this board, especially flame a mod. Next time I'll delete your post, because it has nothing to do with the topic. You don't have a physical ps3 so you can't really comment on it.
Chiyo, that's for Sony, or the company that makes yellow dog linux, to decide. However, I think that you probably will have the option. As I don't have a copy of yellow dog linux atm, I can't really confirm anything for you.
It can be autobooted, theres basically a spot in the flash, 0 or 1, saying which OS to boot to, so you can set it to always boot to PS3, or Linux, and inside linux, you can run the command "boot-game-os" , to swap over to PS3OS!