Today Barry Rosen posted, that the FP10 will be available during this week:

https://twitter.com/B_ROSEN/status/958047480297308160

The most important issues are:

• The JVM in Designer is Upgraded to use 1.8 at compile time 
• Eclipse Platform Upgraded to 4.6.2
• Embedded Sametime Upgraded To 901 By Default 
• Add-on Installer for Notes CCM (Connections Content Manager) 

The full listing of the new features are listed here:

http://www-10.lotus.com/ldd/fixlist.nsf/WhatsNew/86a6c4ba892f0218852581fc0067b4f4?OpenDocument