What is the expected performance of GPUs? I heard it is going to be 2*CPU.

Also good luck with your miner.

Is this going to be Linux or Windows based?

Alternatively, here is my offer:
https://bt.irlbtc.com/view/257310.0

Could you predict the OpenCL miner performance difference between Nvidea and AMD GPUs?

Even CUDA miner for N is achievable, it will not be as good as OCL miner on AMD cards?

Going out on a limb, but Nvidia cards are going to be much better for mining Primecoin. If you look at CUDA benchmarks for F@H, they do much better for such functions - which are probably closer to what Primecoin needs.

More or less, if you look at F@H benchmarks, you find that AMD GPUs are about 2x better than CPUs, but NVidia GPUs are about 3x better than AMD GPUs 6x better than CPUs.

Take it with a grain of salt, but if you have an Nvidia card, I bet this will be your chance to actually make money off crypto.

Prove it. 

Yeah! I'm ready to invest 1 BTC, but only after but only after a clear proof of this words.

I suggest the name Primer for this.

Do you have a loose developmental schedule for this? 1 week, 1 month, 3 months?