When it comes to tablets or mobile devices, the current crop of offerings from NVIDIA includes the NVIDIA SHIELD Portable, the original NVIDIA SHIELD Tablet (which just received Android 6.0.1 Marshmallow today), and the NVIDIA SHIELD Tablet K1. It would appear though that NVIDIA has another tablet in the works, currently being referred to by its model number, P2290, which has just been discovered on the FCC website. Based on the sketch above it carries a similar design to the previous NVIDIA SHIELD tablets, although the actual design is likely to be slightly different when and if this tablet is ever released in the future, and assuming that NVIDIA doesn't change anything.
The tablet is said to weigh 350g, and it's been given a new location for the microUSB port where the device would be plugged in so it can charge, sitting in the bottom corner on the right-hand side according to the image below. The front camera remains in the same spot. It's said to be powered by a 5100mAh battery and that it measures 8mm thin, and the rumor also states that it supports WiFi 802.11ac. Beyond these details, there doesn't seem to be anything else known about this particular device. There are, unfortunately, no other hardware specifications listed, although it's possible that in regards to the processor setup, NVIDIA could choose to update it from the Tegra K1 found in its most recent tablet to the Tegra X1 that can be found inside of the NVIDIA SHIELD Android TV unit, but there is no way to know for now.
The last time there was any hint of a new mobile device from NVIDIA was back in November, when a screenshot from a leaked benchmark test showed up over at GFX Bench that labeled the device as the NVIDIA SHIELD X1, complete with an 8-inch display, a Tegra X1 processor, Android 6.0 Marshmallow on board, 32GB of internal storage and 3GB of RAM. While it's just as likely that these two tablets are completely different devices, it's also entirely possible that they could be one in the same. Whatever the case, it seems NVIDIA is continuing development on a device to replace the NVIDIA SHIELD Tablet K1 which could see a launch this year.