I doubt there will be a cost to use your soldier on that landscape.
The cost will be the need to spend time growing your soldier by doing content that awards the necessary marks and medallions. We are going to be forced into doing the Epic Line to unlock the Skirmish instances. You will need the solo Skirmishes to get the barter currency. If you are a grouper, you have to potential of doing the group instances - Skirmish or Classic.
To me the big issue is the Free and Premium players. They will not have have access to the VIP rental skirmish or classic instances. They will have to wait until they get to Moria and unlock the 2.5.5 Skirmishes. If I remember correctly all they get is two Skirmishes and Great Barrows.
To me it is going to be an annoyance. Another thing I have to do. I do not know how many more times I can do Battle in the Tower before pulling out another tuft of fur.