IIRC Re are down to a single aircraft based in Cork, so double-daily to Edinburgh is very unlikely. They'd need to add another aircraft, which means finding several profitable rotations for it.
TBH Cork-Scotland should have more than a single ATR a day. Edinburgh has been served as much as 3x daily (Aer Arann and Jetmagic), while we've had a variety of operators to Glasgow and Prestwick.
In hindsight, the Ryanair service to Prestwick was one of the worst things that happened to Cork. It made Scotland unprofitable for other carriers and then they just disappeared leaving a weakened route network.