HP's tablet is likely to be more expensive than $99. They usually target the upper half of the market. Without an ancillary revenue stream, they'll need to price for a profit on top of the parts cost.
The new Nexus 7 arrives over 14 months after the original. That's a long time in the rapidly advancing tablet market. I expected it to be at least twice as good as the previous one, and a bit less expensive. Instead it's only somewhat faster, with no stunning new features.
HP's ultracheap tablet is reportedly powered by a single core A7 chip. it prolly would allow you to read and send email but not much of anything else. It may have a rear camera of 1.3 MP..my 10 year old daughter would not want it (she has a Nabi II which houses a Tegra 3(
HP's little job of 99$ tablet has been known for months. NVIDIA is NOT in that market. The most lucrative market is a notch higher to midrange, if you understand the social concept that middle class forms the largest population in the most affluent countries in the world.