Real Madrid published the following announcement on their site regarding the FIFA ban and their appeal to the CAS.
The Court of Arbitration for Sport (CAS) has granted the precautionary measures that Real Madrid C. F. appealed for following the sanction issued by FIFA.
Therefore, the minors affected by said sanction may now play for their respective clubs.
This doesn't mean that Madrid will be allowed to register new players, only that those minors involved will be able to play.
Real Madrid issued the following statement when FIFA's decision was made official:
In light of today's decision by the FIFA Appeal Committee, Real Madrid C. F. wishes to communicate the following:
1. The club regrets said decision, understanding it to be deeply unjust and contrary to the fundamental principles of disciplinary law.
2. The club will begin the appropriate appeals procedure before the Court of Arbitration for Sport (CAS), requesting that the decision be completely overturned, with absolute confidence that said organisation will come to an entirely favourable decision.
3. Real Madrid C. F. will request that the procedure be undertaken in an urgent manner in order to obtain a decision from the CAS as quickly as possible.