Konami Digital Entertainment has released details for the Yu-Gi-Oh! 2014 Mega-Tins releasing on August 29th.  Konami also noted that, unlike previous years, this will be the only wave of Mega-Tins released.
The two Mega-Tin designs are based on powerful tournament Deck themes: Bujins and Fire Fists.  The tins can be placed side by side to construct a mural of Yu-Gi-Oh! monsters.  The tins themselves are over 15% larger than in previous years, to maximize storage space for Duelists’ cards. 
The tins will contain three 16-card Mega-Packs, which will each contain cards from a year’s worth of core booster sets with the following rarity breakdown: 12 Commons, 1 Rare, 1 Super Rare, 1 Ultra Rare, and 1 Secret Rare.  Each tin will also include three variant cards supporting the tin’s theme (Bujins or Fire Fists):  2 Super Rares and 1 never-before-seen rarity--a Platinum Secret Rare version of the Mega-Tin cover monster.  So each tin will include 51 cards, which includes 12 foil cards.  MSRP is $19.99 each.
To peruse other upcoming Yu-Gi-Oh! TCG release, see "More 'YGO' 2014 Releases."