Always well informed DigiTimes said it got information that, with the release of Windows Mobile 6.5, Microsoft plans to rename its Windows Mobile-based handsets by calling them in future simply as Windows Phones, without specifying an OS version number.
Sure, this step makes sense especially because Microsoft still plans to unify the Windows Mobile Professional (touchscreen) and Standard (non-touchscreen) platform and the last name-change from 2007 wasn't as successful as expected and caused more confusion then it helped to understand what the device is about.

Furthermore, Microsoft has a long tradition in renaming its mobile platform. What started as Windows CE back in the mid-90's later became P/PC (Palm-sized PC for touchscreen PDAs) and H/PC (Handheld PC for Netbook-like PDAs). With the introduction of the new platform back in 2000, Microsoft called the new product Pocket PC which later became, with the introduction of the smartphone platform, Pocket PC and Pocket PC Phone Edition. With the introduction of the non-touchscreen smartphone platform, Microsoft changed the whole naming to Windows Mobile Classic (for PDAs), Windows Mobile Professional (for smartphones with touchscreen) and Windows Mobile Standard (for smartphones without touchscreens).

Anyway, new new naming isn't yet confirmed but if Microsoft really plans to change the Windows Mobile brand, it's most likely that it will be announced during the upcoming Mobile World Congress in Barcelona.

Cheers ~ Arne