you can use this to get on with it:
https://www.microsoft.com/en-us/software-download/windows10ISO
I was going to wait but doing a motherboard swap has royally fucked my 8.1 installation, took hours just to get it barely functioning at all and it's still not right. So I might as well jump in on 10 straight away if I'm doing an install anyway. Early adoption!
The download is taking aaaages. My vomputer was broken while they were letting some people preload it.