Great news for the owners of Windows Phone 8 Nokia Lumia handset – starting today, the Amber update is rolling out officially, which was expected to come in late July originally.

The Finnish firm has now started upgrading Nokia smartphones to the new Amber update built upon Windows Phone GDR2. The update is straightforward for unlocked phones while you’ll have to wait your operator approval for locked contract handsets. The update will be available for Nokia Lumia 920, 820, 720, 620, 520, 928, 822, 521 and 810 while Nokia Lumia 1020 comes pre-loaded with Amber firmware update.

Nokia users who upgrade to Amber update will get a range of new features, which includes improved image processing, flip to silence, double-tap to unlock, ability to set default lens for Camera, Glance Screen – a feature shows clock on lockscreen (except Lumia 520 and 625 due lesser display memory), Nokia Smart Camera app, Nokia Pro Camera app (for Lumia 920, 925, 928 only) and Lumia color profile.

The rollout has started now first for the Lumia 920 and Lumia 820 in select countries as well as for the Lumia 521, Lumia 810, and Lumia 928 in the US. As the rollout is gradual and delivery timings may vary by regions or operators, all second-gen Lumia smartphones are expected to get the update by the end of September.

Alongside the Amber update, Windows Phone GDR2 brings a lot more new things including support for FM radio, Data Sense, improvements to Xbox music and the Internet Explorer browser. In the meantime, OEM’s like Samsung and HTC had already started pushing GDR2 OS Refresh from last month.