The answer to that has always been: no. MediaWiki will not support fine-grained viewing control of pages, ever. You can use extensions like Lockdown to achieve a similar effect, but because of some fairly basic MediaWiki structural decisions, they will not work very completely (and should clearly note this in their readme, I would hope -- I know, for Lockdown).
Could you please send me a pointer? Google did not return anything useful
I would guess: http://www.mediawiki.org/wiki/Extension:Lockdown