Sega showcased about twenty minutes of PS4 gameplay of Valkyria: Azure Revolution, that will be released in Japan for PS4 and PS Vita on January 19th.
The video (you can find gameplay at the 04:03:05 mark) reveals a brand new mission that was never shown before, culminating with a boss battle against the Dragon-type giant mecha that was introduced a couple of weeks ago.
Incidentally, this is also the first time in which we see in action two recently revealed members of Vanargand, Jordur Kuvist and Sara Benner.
Incidentally, the mission is played by models Yuka Kuramochi and Saki Yoshida. If you enjoy cosplay, you can see them dressed as Brunhild and Ophelia before and after the gameplay.