In addition, the PS Vita game will also receive a patch (1.02) which will give them two dressing room costumes for Lil and Laarg. And handful of gameplay improvements. The DLC itself will contain new outfits for the protagonists, 18 levels, seven new challenge modes and four Trophies.
If you’re planning on getting this, better hurry though as this cheap price is a limited offer. After two-weeks, the DLC will revert back to its original price of $4.99.
Source: Official US PlayStation Blog