Yep, it definitely needs to be off-switchable if there indeed will be an inner light.
Otherwise it'll be too distracting in a home theater setup with a front projector. The less extra light there is the better the pic on your screen.
A light inside could look tacky too, like those terrible modded PC's!!
In that video linked above (with that cute german presenter
) it showed clearly that at least the flap covering the memcard slots was semi-transparent, so maybe it indeed is true the whole console is such.
Maybe it'll have UV lights inside, and UV reactive liquid runnig in the heatpipes, making it look like it was a living organism with veins and such.... YUCK! That could be tacky if done without taste.
Personally, I'd prefer a solid black, but as long as it is very discreetly semi-transparent, as seems to be the case because in no other product photos the transparency has not been visible, I'll be able to live with that.
It's just that transparent cases are soo out of fashion already... However, I have trust in Sony design skills, so it won't be too garish.