We reported about the latest cumulative update Build 10586.63 from BuildFeed. Now it seems this is the build that will be available to Windows Phone 8.1 users as the upgrade build, when they upgrade to Windows 10 Mobile soon.
Microsoft is very close to releasing the Windows 10 Mobile update for older Lumias running Windows Phone 8.1. We shared an anonymous tip claiming official Windows 10 Mobile roll-out to begin on January 12, so seems Carriers are already in preparation mode for their devices. T-Mobile Germany also confirmed that Windows 10 Mobile update for Lumia 535, Lumia 635, Lumia 640, Lumia 640 XL, Lumia 830 and Lumia 930 is coming very soon.
You can read what features and changes Windows 10 Mobile brings with itself by clicking here. Click here to read our detailed tutorial on how to prepare your Windows Phone 8.1 devices for Windows 10 Mobile update. You can read all our Windows 10 Mobile tutorials by clicking here.