Microsoft is planning to share further details on Mango and the future of Windows Phone in May, WinRumors has learned.

The software giant is currently hard at work on “Mango”, its next major release of Windows Phone. Microsoft has promised to ship “Mango” later in the year. “Mango”, the codename for what will likely be named Windows Phone 7.5, is currently in the early beta stages at Microsoft. The company revealed a number of new features in February that will ship as part of its Windows Phone point release later this year. Nokia is also reportedly waiting for the next release of Windows Phone before it unveils its first Windows Phone device.

WinRumors understands that the company plans to share a future roadmap for Windows Phone during May. Microsoft will hold a special developers day on May 25 in London where it plans to share further details on the future of Windows Phone and “Mango”. Microsoft is describing the event as a peek at the future and what lies ahead for Windows Phone. “As well as new capabilities, we’ll examine any changes to the tools and SDK and explore what opportunities these might create,” says Microsoft. “At this stage we’re unable to elaborate any further but expect it to be a day packed-full of inspiring information.”

“Mango” currently contains multitasking, Internet Explorer 9 mobile and Twitter integration. Microsoft’s unveiling in Mobile World Congress ties up some of the unknowns with “Mango” but only scrapes the surface of what the release will contain. The emergence of a special developers day confirms that Microsoft plans to share a lot more information on future Windows Phone plans in May. WinRumors spoke to Achim Berg, Corporate Vice President of Windows Phone Marketing, at Mobile World Congress and he confirmed that the forthcoming changes are part of a platform release. Berg confirmed that the company is currently working on when and how they will unveil more information about “Mango”. Microsoft will unveil further information about the Internet Explorer 9 mobile component at MIX11 in April but Berg says the company will also offer more tid bits after that. Berg hinted that this could be around the May time-frame and that Microsoft didn’t want to unveil too much too soon in case “competitors copied us”.

Microsoft is planning to mark Windows Phone 7′s first birthday with a platform release to upgrade functionality and re-brand the platform to a point release (think Windows Phone 7.5). Berg refused to confirm the final branding at Mobile World Congress, but did suggest that the changes are big enough to warrant a new release and point increment. Although Microsoft is still working on the release, codenamed “Mango”, the software giant is expected to brand it as Windows Phone 7.5 as an interim before the platform is aligned neatly into Windows 8 and Windows Phone 8.