Looks like Mobile Insiders have a treat I'm proud to announce that the final build of Windows 10 Mobile is set to release this December.
Here's a few quotes:
Source: Microsoft Rolls Out Windows 10 Mobile Preview, Final Version Coming this December - Neurogadget.comUsers of Lumia 550, 950XL and 950 smartphones already use Windows 10 Mobile, but the company has promised that the other users of Lumia devices will be getting this new OS in December, with Poland touted to be among the first recipients. According to a report by Tech Times, Polish users of Lumia 630, 635, 640, 735 and 830 will receive the new Windows 10 Mobile OS as from December 14. However, the report also adds that this is only confirmed for the users of Orange mobile
However this build is only available to those who have the Denim builds of Lumia.