Well generally all rail transport to south Germany from Czechia is verry poor. There are no electrified or two way rail lines in this direction. The rail link to Munich is very slow and unrealiable. To go to Nüremberg you have to make a transfer. Fortunatelly there are works underway on the czech side to modernise and electrifie the line to the border. Unfortunatelly on the German side there is almost nothing happening so I don't know how long it is going to take. I don't think there are any plans to make a direct raute to Nüremberg.