Just for the heads up, God Eater DLC is semi-up on Steam now. Only available for those who didn't pre-order Tales of Zestiria. It's automatically added to your Steam account. Can be found in Library > Tales of Zestiria > DLC.
Tales of Zestiria (Pre-Order) on steamdb Tales of Zestiria (Normal) on steamdb
^ As you can see via steamdb, God Eater DLC doesn't show up for people who own cameo costumes and such. I have a feeling they forgot something. Then again, their support for Steam version hasn't been that great (I hate to sound like a broken record, but Alisha's Story still isn't available for purchase on Steam Store since November 23. While it has been up on PSN)