A Silent Release is a special General Release where you will not get an automated Update Notice via the blue menu when you wear your Signature toy.

Why?

Well either:
1) the benefits of the release are small compared to the last General-Release update, so or
2) it is also released concurrently as a Release Candidate. But the benefits to new users are deemed to outweigh the risks associated with a Release Candidate, and so it is the default version when you buy a new set. In this case, either this version or a subsequent one will eventually make it to a normal General Release, which will notify all wearers.

Existing users can update to this latest release by going to the Secret Warehouse and clicking on the Update Switch and follow instructions.