A:Answer Yes, this processor has come out, but it sold out really fast due to the fact that it outperforms the i9 9900k by over 30% and they are the exact same price.
9900k: https://www.newegg.com/core-i9-9th-gen-intel-core-i9-9900k/p/N82E16819117957?Description=i9%209900k&cm_re=i9_9900k-_-19-117-957-_-Product&quicklink=true
10900k: https://www.newegg.com/intel-core-i9-10900k-core-i9-10th-gen/p/N82E16819118122?Description=i9%2010900k&cm_re=i9_10900k-_-19-118-122-_-Product&quicklink=true
The one downside to this processor is that it only supports Z490 Motherboards so if you previously had an i9 9900k, you would have to get a new motherboard because chances are, you have a Z390. Have a nice day.