Here's the original MobileGeeks.de article, though it's in German, so I've summarised it here:
Microsoft also teased a huge 6.5-inch phone during the keynote speech at Computex 2014. It runs Windows Phone 8.1, of course, and it is from the Taiwanese company Wistron. The device is a reference design and offers a full HD display and a Qualcomm processor:
While many details are not available yet, a Qualcomm Snapdragon 800 MSM8974 is used, running at up to 2.3 GigaHertz. The display is 1080p and we were able to get a hands on:
The Tiger shown in the video is evidently a prototype at best, though seeing an aluminium frame and such high specs bode well for the future. Also interesting is that all the other 8.1-ready designs being shown off had physical/capacitive controls, whereas the Tiger implemented these virtually, as Microsoft has been pushing its licensees to do.
The virtual control keys are shown being minimised and brought back with a swipe in the video above.