Suzeman - I find it unlikely that EZY will open LPL-CPH and I have not heard anything about this here in CPH.
I believe that the EZY response to the new Norwegian CPH-LPL service is the increased capacity on the MAN-CPH route - from May going 9 flights a week instead of 7, with new flights Monday and Friday (same days you have heard they should be operating LPL-CPH).