Not all handsets will get Update 2, but more devices are starting to receive it, and the latest is the BLU Win HD LTE, which the company has confirmed will also be upgraded to Windows 10 Mobile.
Microsoft Lumia 640 review: Impressive device, affordable price
Windows 10 signoff will occur in mid July
Windows 10 promo
"..is now a top seller and lets you put all your favorite sci-fi ships against each other" - Brad Wardell
galactic civilizations 3
Review: Elephone P6000 - rethinking the flagship
After adding support for MKV video playback to Windows 10 last year, Microsoft has now brought the same feature to Windows Phone 8.1 Update 2 - but that means it won't be available for everyone.
Update 2, or GDR2 as it's also known, was unofficially made available to a number of Lumia devices. It brings some UI changes, a new way of viewing Settings and support for new devices.
Microsoft has confirmed that Windows Phone 8.1 Update 2 - which debuted on the company's latest handsets, the Lumia 640 and 640 XL - will come to existing devices... but not all of them.
Microsoft announced two new additions to its smartphone range today - the Lumia 640 and 640 XL - and we had some hands-on time with both of them, which included some intriguing OS observations.
Development continues on Windows 10 for phones, but it seems another update is on the way to Microsoft's mobile OS, as its Dev Center site now includes references to 'Windows Phone 8.1 GDR2'.
Some folks are claiming that Windows Phone 10, or rather Windows 10 for phones, has started to show up in logs and benchmarks. We take a closer look at these claims and their trustworthiness.
Windows Phone previewers might soon get a new build of the OS to try out as build 14203 has been publicly mentioned by Microsoft as an upcoming update. This is likely the long-rumored Update 2.
Microsoft's next update for Windows 8.1 will be called 'August Update', and will be released on the next Patch Tuesday, August 12 - but unlike the last update, this one won't be mandatory.
Microsoft has released the final version of Visual Studio 2013 Update 2, which adds a number of new features such as support for making universal Windows apps and more.
Microsoft has released a Community Technology Preview version of Visual Studio 2013 Update 2, which will add a number of new and improved features to the company's software tools.
Microsoft has released new Windows Phone 8 "Update 2" and "Update 3" emulators this week for app developers, including adding support to test apps in 1080p resolution.