CUBA: Big Changes in Castro's Guard http://thehavananote.com/2009/03/cuba_big_changes_in_castros_gu.html
What has happened is that Raul Castro, now President of Cuba, has sacked his brother's closest followers and advisers in government.
Both Vice President Carlos Lage and Foreign Minister Felipe Perez Roque have been given pink slips. These were Fidel's most obvious heir apparents and his chief ideological spear carriers in the next generation of Cuban political leadership.
This is one of those historical pivot points in normally opaque (often Communist) regimes that will be remembered for generations.
Raul Castro seems fully in control now -- and he's done with ideology.