We've seen an image or two of the old Sony Ericsson prototype Windows Phone that was canceled before. The device, code-named 'Julie', was a qwerty-slider and looked quite tantalizing at the time. Since then, SE has jumped on the Android bandwagon while leaving the door open for Windows Phone. We thought for a moment that SE was teasing us with a new Windows Phone for CES, but alas it was more Android.
Now, two new images have leaked of a Sony Ericsson Windows Phone device. Clearly a prototype not much is known about this phone but we're taking a guess that it is just the same qwerty-slider that we've seen previously. If you look closely at the top photo, the thickness of the device and "break" midway suggests that this is a slider.
What does this all mean? Unfortunately, we don't have any evidence that SE (or just Sony going forward very soon) has any plans for a Windows Phone. But Mobile World Congress is coming up at the end of February, so who knows maybe Sony will have something to present.
The site NokiaWP, who received the photos, claim that this is running Windows Phone 7.5 "Mango" which would definitely indicate active development. However, we cannot verify either claim at the moment.
Source: NokiaWP; Thanks, Juddy, for the tip!