SEGA of Japan have today announced that those who missed out on the Japanese Valkyria: Azure Revolution 2.0 demo earlier on (for which you had to register in advance of its release), will get another chance to play a new demo of the game in late December. The new demo will feature the prologue chapter of the game, and this time the save data from this new demo will also carry over to the full game. Valkyria: Azure Revolution will be released on January 19 for the PlayStation 4 and PlayStation Vita in Japan.
Source: Official Valkyria Twitter account. Thanks to Gematsu for their translation.