Hi,
Yes, sorry for the delay. We originally planned to release the first Beta (with the finalized feature set) last week and the final release a few weeks after, however we got a few interruptions and this got delayed. Currently we are running the final tests on the last feature of v5.4 – the new file/folder synchronization engine for Linux machines. We expect to finish the tests and polish up the remaining rough edges in the few next days and will then release a beta. Depending on the amount of feedback on the Beta, we will publish the final release in the next few weeks following the beta.