DUB-PVG: China Eastern
DUB-IAH: EI, Ethiopian 5th freedom
DUB-MIA: EI/AA
Those seem to be the 3 long haul rumours ex DUB with the most legs atm.
Anna.aero analysis also agrees that DUB-MIA is viable. Aer Lingus would be more that more logical choice given there is more demand in the DUB-MIA direction.
Skyscanner Unserved Route of the Week: Dublin-Miami