As seen on Ars review:
http://arstechnica.com/apple/reviews/2011/07/mac-os-x-10-7.ars/14
Lion has taken the hint from its younger brother. Arbitrary scalability is gone. In its place is a single check box to enable "HiDPI" display modes. (This option is still hidden away in the Quartz Debug application, so it's clearly not an end-user feature. But unlike all previous incarnations of resolution independence, this one actually works.)


http://arstechnica.com/apple/reviews/2011/07/mac-os-x-10-7.ars/14