I doubt they'll ever offering anything from here during the winter apart from the odd Lapland trip.
As for operators next summer, it was mentioned on various sites that SWG would not be returning for S20 and that their own equipment (or from other TUI Airlines, TUI fly Nordic were mentioned regularly) would be used. What was going to happen remains a mystery unfortunately. I know that DUB was showing an A320 for various services last summer before they were cancelled. At present they are also still showing with the season length we've seen in previous years too for both 21/22 (running from the 3rd weekend of May to the end of September.)