There is a typo in the overview beat. 'MCS' is given as the abbreviation for Multilevel Security instead of 'MLS'.
MCS is actually more accurate than MLS -- we have multicategory security which is similar to MLS, but subtly different.
Well there was a issue with the overview in the release notes since both MLS and MCS was referred from it http://fedoraproject.org/wiki/Docs/Beats/OverView Fixed now. Thanks. The notes are already frozen for the ISO images IIRC but the web errata should have this fix.