A concourse was originally designed as an A380 hub but was never used as such with 777s using it too. A380s sometimes land in B concourse.
You wont know until you land which Concourse it will be nor which one your connection will leave from.
If the info doesn't show on your ICE system then check on the board as soon as you disembark. A dedicated train runs between A and B concourse and takes a couple of minutes.
If your connection leaves from A you will board directly from the J lounge - if B you board at the gate as normal.