Microsoft has confirmed Windows Phone 8.1 Update 2 "GDR2" for select handsets, including the Lumia 735 and Lumia 830. Availability is currently unknown, but it's in the works.
From Windows Central:
From Windows Central:
In order to be able to enjoy Windows Phone 8.1 Update 2 you need to be rocking either the Lumia 640 or the Lumia 640 XL as these are the only Windows Phones with access to that particular release. Microsoft today shared details on Update 2 during a Q&A session at the UK launch of these two smartphones, stating that the update will come to select devices in certain markets.Windows Phone 8.1 Update 2 confirmed for select existing smartphones
The company did note that both the Lumia 735 and Lumia 830 would receive Update 2. It's not known when or where the update will be rolling out, not to mention which handsets will receive that version of Windows Phone 8.1. All we know is the update is planned for some Lumia 735 and Lumia 830 handsets.