Based on rumors and common sense.
If a compromise is reached before December 20th, expect ratios close to Delta's SLI proposal. There will be no dynamic anything. Once the list is published, that's it.
Status Quo is the primary factor driving SLI methodology for both the MEC's, their negotiators and the arbitrators.
Ideally, perfect status quo alleviates the need for fences since perfect status quo results in both sides being where they are currently - no changes. Since this merger started there have been many pilots, who see what their longevity would hold at Delta and have been dreaming of moves to the left seat of a widebody category for a whole lot more money. If this is done right, there will not be a whole lot of movement. Remember, status quo is the goal ... same as you have now.