Nothing appears to be going on, from what we can see publicly anyway. Just moving forward with the arbitration cases, which were at one point supposed to be a pressure tactic aimed at reaching a negotiated resolution, but now appear themselves to be our main hope of a positive outcome.
Could be wrong, but it seems DRC appear willing to go through the ICSID pain and see what the outcome is before trying to work out the best way forward for them from there. See if they lose first. Then see if they can ignore the ruling. Then if not, consider whether the penalty is manageable to perhaps try and get the Chinese to pay it (at a reduced, negotiated level) in exchange for control over Manono in totality. OR if (when) they lose and the penalty is very large, to then enter into negotiations with AVZ to accept some kind of terms. Possibly like, here take a licence for Roche Dure in exchange for agreeing to waive the penalty.
But yeah unless something changes in the next 6 months it seems like DRC are playing the 'lets wait and see what happens' game, rather than being smart and negotiating to settle the situation pre-ICSID ruling.