The Pokemon Company will release the Mega Diancie-EX Premium Collection for the Pokemon TCG on February 4th.
The set focuses on the Mega Diancie-EX, the fairy Mega Evolution Pokemon.  The box will include a new foil card featuring Mega Diancie-EX, an oversized foil card featuring Mega-Diancie-EX, a shining Mega Diancie collector pin, a coin featuring Mega Diancie, 6 Pokemon TCG boosters,  and a bonus online code card.  MSRP is $39.99.
This release will arrive the same day as the new Pokemon XY: Primal Clash Booster (see "'Pokemon XY: Primal Clash'").