The Pokémon TCG: Diamond & Pearl Majestic Dawn expansion was released on May 21st, 2008 . Press release pictures from this set have been added to an Imageboard thread.

Press Release

The wait is over! A new day emerges for Pokemon when the all-new Pokemon Trading Card Game expansion Diamond & Pearl Majestic Dawn hits store shelves nationwide on May 21, 2008! This latest installment features 100 cards and is guaranteed to change game strategy for Trainers everywhere. With more new Pokemon, new Pokemon LV.X, a cool new Stadium card, and the debut of two new powerful evolutions of Eevee, players can expect a titanic clash of some of the most powerful Pokemon ever!

Features:

• New powerful Pokemon LV.X cards - including Garchomp LV.X and Porygon-Z LV.X<
• Legendary Pokemon Darkrai and rare Pokemon Cresselia
• Seven evolutions of Eevee - including all-new Leafeon and Glaceon
• Features booster packs for collectors and players of all ages
• Booster packs include 10 randomly inserted game cards
• Features theme decks for beginner and intermediate players
• Theme decks will be available in two 60-card theme decks - "Polar Frost" and "Forest Force"
• Theme decks include one guaranteed foil card

Source: http://www.go-pokemon.com/