The rtas will run as native version on pt 10 HD.
It's basically the same configuration of macs as it was for the past 3 years, so yes it will work. Same processors just slightly faster, and all the other parts are the same as for the past 3 years.
As for the ram (look under tech specs), they are ECC so they should be registered and buffered, if I'm wrong I hope someone will correct me.