The official Pokémon Tretta website has announced a few new goods that will be released in April and May of 2013. The Pokémon Tretta - Collection Trunk (ポケモントレッタ コレクショントランク) stores 99 Tretta's and 1 Tretta Report card. It has a large Monster Ball on the front and a carrying handle to make it easier for players to bring their Tretta's to a gaming unit. It will be released in Japan on April 25th, 2013 for the suggested retail price of 2,604yen (tax included).
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The Pokémon Tretta - Tretta Sleeves (ポケモントレッタ トレッタスリーブ) protect a players Tretta's from scratches and dirt. Packs of 15 will be sold starting on May 16th, 2013 for the suggested retail price of 420 yen (tax included).
Additionally, 12 more tretta from the upcoming expansion
Search For That Trio Alongside Nyarth have been revealed, including a Legend class Rayquaza tretta, a Lizardon tretta that marks the very first non-legendary/mythical Pokémon to receive a Master class tretta, the first Poison-type tretta in Gureggru and Tamagetake, and another couple tretta with the Search mark, which has been revealed to be a function that allows the player to manipulate the Search Roulette to a certain degree.
Sources:
http://www.pokemontretta.com/goods/trettacase.html#p04,
http://www.pokemontretta.com/goods/etc.html#p06 and
http://www.pokemontretta.com/tretta/t05/index.html