In the Clarifications section of EIP 1014 (create2) it says that "This EIP makes collisions possible."
It doesn't explain how collisions are now possible, but it links to EIP 684 (Prevent overwriting contracts), which says "Currently this is not an issue because there is no way to create a contract with the same address twice without spending >2^80 computational effort to find an address collision, but with #86 this will change."
So, now I'm a little confused. Is it that create2 now requires less than 2^80 to find a collision? Or does this sentence refer only to the case when a create2 is called twice with the same arguments resulting in the same address?