Now we've got Windows Phone 8.5 out of the way we can get back on the Windows Phone 9 trail.

We're scouring the web everyday to bring you all the latest on Windows Phone 9 and we'll be constantly updating the information below to give you the best picture of what's to come.

Windows Phone 9 release date

Back on the WP9 trail, and initial rumors suggested that the Windows Phone 9 release date would be sometime in 2013, with reports claiming it would arrive just in time for Christmas, but as you might have noticed, Christmas has been and gone and we're now in a Windows Phone 9-less 2014.

Other reports reckon Microsoft will kill off Windows Phone 8 by September 2014, giving an indication that while it didn't make it out the gates in 2013, version 9 could well be on its way very soon.

Windows Phone 9 tweet

That seems more likely and not only because it wouldn't require time travel to be true. Supporting that are comments from Russian blogger Eldar Murtazin, who posted to Twitter that Windows Phone 9 will launch in the second half of the year. He correctly predicted Microsoft's acquisition of Nokia, so he could be worth listening to.

The update was also being referred to as Windows Phone Blue, a development name which mirrors an update to Microsoft's new Windows 8 desktop platform - but it's turned out that Windows Phone Blue is actually Windows Phone 8.1.

Sadly the most recent rumors suggest we won't be seeing Windows Phone 9 until sometime next year. A leaked document mentions dates of between Q2 and Q3, which covers April-September 2015 and that's just for a preview build, so the final release might be even later.

Windows Phone 9 or just Windows 9?

We're seeing reports that suggest Microsoft may look to ditch the divide between its smartphone platform and the one it uses for tablets and PCs - rolling them all into one tidy bundle called Windows 9.

One suggestion is that the upgrade will see Windows 8 merged with Windows Phone in an attempt to tackle Google's Android/Chrome combination which is growing ever stronger.

Alternatively we could instead get the aforementioned Windows 9 all-in-one system after a Microsoft employee stated "currently testing Windows 9 OS on Nokia, HTC and Qualcomm device" on their LinkedIn profile.

In fact it's now been all but confirmed that Microsoft intends to merge its operating systems, as during MIcrosoft's quarterly conference call CEO Satya Nadella said that "We will streamline the next version of Windows from three operating systems into one single converged operating system for screens of all sizes."

Eldar Murtazin has something to say on this subject too, tweeting that Windows Phone 9 will be the same on phones and tablets, replacing Windows RT, though he made no mention of Windows 8, so that will possibly still be separate.

We keep seeing mentions of it as Windows Phone 9, everywhere from LinkedIn profiles to leaked documents, so it looks like it may keep the 'phone' bit in the name at any rate.

Windows Phone 9 features

Murtazin also has some insight into the design of Windows Phone 9. Apparently it will be a complete overhaul which will remove the tile based Metro interface that Windows Phone is currently known for.

That would make sense if Microsoft plans on using the same interface for both phones and tablets. It also ties into the rumors about Windows Phone 8.5 seeing some Start screen changes. Murtazin went on to say that the interface would be more influenced by Android than iOS.

Windows Phone 9 devices

One of the big issues with Windows Phone 8 was that you couldn't get it on your Windows Phone 7 handset, instead you were lumped with Windows Phone 7.8.

Lumia 1520

It's thought that Windows Phone 9 won't be so restrictive, with Windows Phone 8 users in line to get the upgrade which means you shouldn't have to worry about picking up a Nokia Lumia 1520 or HTC 8X.