From help of http://www.theprp.com/2014/09/12/news/a-closer-look-at-slipknots-new-bassist-drummer/#more-91235 you get to see the new members. The drummer is hard to identify, but it's rumored to be Jay Weinberg. As you can see with the bassist, he has tattoos on his hand that can help identify him. His name is Alessandro "VMAN" Venturella. He's the guitar tech for Mastodon.