RetroAndroid has done a separate video showing two PDFs on the Teclast X98 Air 3G. I believe this was originally an Android tablet that has since been flashed to Windows 8.1.
See the video after the break.
Previously here:
RetroAndroid Reviews Teclast X98 Air 3G
Teclast X98 Air 3G: Windows 8.1 Firmware
Another Teclast X98 Air 3G Update
More Teclast X98 Air 3G Updates
Teclast X98 Air 3G: Windows Firmware Beta Release
Teclast X98 Air 3G: Windows Firmware Soon
Teclast X98 Air 3G: More Praise?
Teclast X98 Air 3G: iambillbil Praises
Teclast X98 Air 3G: iambillbil Evaluation Begins
Teclast X98 Air 3G Gets A Review
Teclast X98 Air 3G: iambillbil Evaluation Coming
Teclast X98 Air 3G In User Hands
Teclast X98 Air 3G: Full Details
More Revealed About Teclast X98 Air 3G
Teclast Admits Existence Of X98 Air 3G
Teclast Leaks New X98 Air 3G
Three Videos: Teclast X98 3G Air
Mike Cane’s xBlog 
Leaked image of new dual boot that teclast announced yesterday.
http://bbs.teclast.com/thread-257473-1-1.html
Just a clarification, the official post by teclast about dual boot, without virtualization is here
http://bbs.teclast.com/thread-257473-1-1.html (its a trial limited to 10 people, maybe it will be availible to everybody soon)
The leaked image of how this dual boot works is here
http://bbs.teclast.com/thread-257569-1-1.html
But you must reply to get this image
http://bbs.teclast.com/data/attachment/forum/201411/15/165746epccb7p8bu2u40kc (add .png at the end of this url)
Also of interest is the dual system method on xda that requires a 1 click bios flash every OS change
http://forum.xda-developers.com/showpost.php?p=55875461&postcount=250
The Chinese took this method and made it into a dual boot by allowing bios flashing at boot, the instructions are here.
http://bbs.teclast.com/thread-257422-1-1.html
And then there is still the 200 dual system virtualization tablets that were sold by teclast to a limited number of people.
I’m also wondering how is teclast achieveing the true dual boot?
Are they using a bios that supports 32 and 64 UEFI?
Did they make a Android version compatible with 32 UEFI?
And most unlikely, but most awesome, did they make a Windows version compatible with 64 UEFI?
I saw the Weibo about the ten samples. Thought it was the other virtualization system so didn’t bother to click. I think I’m holding off on more until something for real is shown in video. And what method will Onda use? And are all of these via Intel?
Judging by the Onda video it looks like virtualization becuase there is no boot logo or boot wait time, or they could have one OS’s ram in hibernation on the hard disk and the other OS’s ram in action on the ram stick and then they switch. But from the leaked image it defeintly looks like the teclast dual system is dual boot.