Also in their 347th Prinny Bomb newsletter, Nippon Ichi Software America also confirmed that another 12 Playstation Network avatars have been uploaded to the North American Playstation Store.
Unfortunately if you reside in a PAL region there is no word on when the next set these of avatars will be available, for which there are only four or five in total at this moment based on Hyperdimension Neptunia Victory from memory.