According to mang0e, a data miner of Fortress night, an animation of XL male skin has been added to the 15.40 version of Fortress night. At present, the only existing XL male skin is mieba. This may indicate that epic is preparing for the return of mieba.
At present, however, all this is just speculation. Maybe epic is planning to launch another character suitable for the animation. Until epic makes a formal statement, everything is unknown.