Wizards of the Coast has announced that it will no longer release prepainted Dungeons & Dragons Miniatures sets.  The last set is Lords of Madness.  

WotC will continue to release some prepainted minis in other formats, such as the Beholder Collector’s Set released last fall.  Minis will also be incorporated into other products, such as the Wrath of Ashardalon boardgame (see "Wrath of Ashardalon").  

The company will also offer other options for character and monster representations on the tabletop, such as the tokens in Monster Vault