This release has now been replaced with 6.3.28b.
The source version for MySQL Cluster 6.3.28a has now been made available at ftp://ftp.mysql.com/pub/mysql/download/cluster_telco/mysql-5.1.39-ndb-6.3.28a/
This replaces MySQL Cluster 7.3.28 which has been withdrawn.
You can either wait for the binaries to be released or if you’re in a rush then you can find instructions on building the binaries for yourself in the earlier article: “MySQL Cluster 7.0.7 source released“.
A description of all of the changes (fixes) that have gone into MySQL Cluster 6.3.28a (compared to 6.3.27) can be found in the MySQL Cluster MySQL Cluster 6.3.28a Change Log.