SanGreal said:He makes it pretty clear why they plan to include linux on the harddrive. I wouldn't expect much in the way of homebrew game development support.
..but you could homebrew games on PS2 linux. In fact IIRC you have almost total access to the metal if you want it.
Considering that IBM and Sony are open-sourcing Cell, considering you can download NVidia tools and Cg for free on PC, I'm not sure why they'd try to close the PS3 Linux environment. In fact, Kutaragi specifically mentions it being "open" and the software "ecosystem" he's discussing won't happen if programmers can't come to the system and use it without SCE licensing and so forth. So I'm pretty sure homebrew game dev will be possible (perhaps with some caveats, of course, like not being able to commercialise any games devved in this way etc.).
edit - he actually addresses this directly:
Just like Apple Computer was open back then, if PLAYSTATION 3 is released and becomes open, an ecosystem will be driven. When it became Macintosh, even though Apple didn't do everything, Adobe came and someone came, the ecosystem took off. PC was like that originally. But they absorbed everything (into MS Windows)... Well, it may be their aesthetic, but it's become uncomprehensible even what an OS is.
Until now, we'd provided libraries and game makers had made things in-house, it's not possible anymore though. To do anything, you need a larger expansion. But it'll turn out like that I think. For example, what surprised us is that an iTunes-syncronization software for PSP was released quickly. If it's evaluated as interesting, various things that run on it appear.