In a server side improvement rolling out today, WhatsApp on every OS now tells you when your messages have been read. The trigger to this is both the ticks turning blue meaning your message has been read.
Heres how it looks & works
Click to enlarge
Message info now tells you when your message was delivered & when it was read
Long press on any message & click on Message info to get these details
Message info now tells you when your message was delivered & read
This is a nice little addition which many would prefer and many wont. The improvement has started rolling across OSs from today which includes Android, iPhone, Blackberry, Windows Phone, Nokia S40, Nokia S60 and Blackberry 10.
Additionally in a group chat, a second tick will appear when your message has been received by all the members of the group and both ticks will turn blue when it has been read. This is a welcome improvement too.
Heres what the FAQ at WhatsApp reads