The coin mainnet is live and we already have people in the discord hashing away and finding blocks.

As to resistance. GPU mining is technically possible. However it would require a rewriting of existing mining and pool software to do it. Xmr-stak for example precompiles the mining algorithm and loads it into memory. When the algorithm changes when a new block is detected the algorithm needs to be recompiled and xmr-stak needs to be killed and relaunched. This is why xmr-stak can't switch coins on different algos. So you can mine it with a GPU technically, just current GPU miners are not coded in a way to change algo on the fly. Moreover GPU miners do not get data on the current block height which is used to change some algo parameters to create the variance. Therefore pool code needs to be refactored to broadcast this information to GPU miners.

So as you can see it would be quite difficult to build a GPU miners or edit and existing one to mine this coin. Future development of the coin will work on developing more ways to randomize the algorithm which would simply make it infeasible for a GPU miner to be developed. By extension if GPU miners can't be developed, Nicehash can not be deployed against the coin.