The Japanese Xenoverse page has a BIT more info...

Under 2015/03/08 15:30 サーバーの接続状況と今後の展開に関しまして_訂正（3/8）:Beneath where it says PS4/Xbox One still having difficulties connecting:We've been focusing on improving the servers since the launch of the international versions, but as it will take some time, we'll also be rebalancing the gameplay simultaneously.Current Schedule:Week of 3/9: Adjustment of certain Z-soul effectsSecond half of March: Battle/balance adjustmentsOf course, improving the servers is our top priority. We are working our hardest.Sorry for the trouble and thank you as always.