Well, it's hard to diagnose these things from sound bites, but it sounds to me like the lifters might be having a problem. This could also be caused by oil supply problems to the lifters, because they need good oil pressure to work properly.
If it is an oil supply problem, then it might also be affecting the bearings or other moving parts, and might be a cause of that other noise you are hearing. The other noise might be a rod knock, as Scottie J points out, but I can't really say for sure.
I think it should be looked at by a qualified RE mechanic, since it might be covered under warranty.