Error 404 =D
It's not by NVidia but it is using the NVidia K1 Soc, basically it's this.
http://www.shop.bt.com/products/nvidia-shield-tablet-k1-940-81761-2500-500-BQ80.html
But I'm not sure I would go with it, even though it has some nice controls added. The Sheild tablet has the same specs but with a newer O.S and it's about a third cheaper. That extra £80 would buy a helluva Bluetooth joypad for it too. ;)
No Bigsofty is a new chinnese console JDK(something) with a Tegra GPU... seems can emulate PS1 PS2 and another consoles... Comes with Android.
In FB someone put a new Nvidia HandHeld, but really isn't a real Nvidia.
I think is better you comment more cheaper and is a real Nvidia.