Can an Access Provider refuse to negotiate with an Access Seeker on the grounds that the Access Provider’s new Access Agreement submitted to the SKMM has yet to be registered?

No, an Access Provider may not decline to engage in any discussions or negotiations with Access Seekers solely based on the ground that the Access Provider has Access Agreements with other parties pending registration  with the SKMM.  Parties are 

reminded of their obligation to negotiate (under subsection 5.4 of the MSA) with Access Seekers who wish to seek access.  Access Providers may not refuse an access request except when the Access Provider has valid ground(s) of refusal as provided 

for under subsection 5.4.11 of the MSA.