Microsoft has confirmed that Windows Phone 8.1 will be rolling out to current Windows Phone 8 users in the next couple of months.
As to when you will get it exactly, will depend of course on your operator and the manufacturer who makes your phone, however Joe Belfiore, the head of Windows Phone at Microsoft, has confirmed that it will be rolling out to all Windows Phone 8 phones very quickly.
"Windows Phone 8.1 will start rolling out to consumers in the next few months," said Belfiore on stage.
If you want to get hold of it even quicker you'll be able to buy it on a couple of new Windows Phone 8.1 handsets, yet to be announced (read Nokia) at the end of April / beginning of May.
Microsoft hasn't yet confirmed when developers will be getting the new update to the operating system, but will suspect it will be sooner rather than later.
The new update brings with it a number of features including a new personal assistant called Cortana, named after the personal assistant in the Halo games on the original Xbox and Xbox 360.
Other features include a new Swype like keyboard and Wi-Fi Sense that allows users to control the phone's Wi-Fi and only connect to Free Wi-Fi when in range.
Nokia has tweeted that Windows Phone 8.1 will be "Coming soon! Lumia will offer the best experience of WP 8.1" with a picture of the current Windows Phone 8 range.
Microsoft has stated the following:
"Windows Phone 8.1 will start rolling out to current Windows Phone 8 users over the coming months. It will also come pre-installed on new phones starting this month. Cortana will launch shortly in the U.S. as a beta, in the U.K. and China in late 2014, and in other countries in 2015. Registered developers can update their phones to Windows Phone 8.1 as part of the developer program later this month."