No support yet, in the sense of no specific development done for that third party plugin. At the moment, all our focus has been on core Cinema 4D features and things that are built in to C4D. I'm not personally familiar with X-Particles, so can't say how well it works with Corona, if there are things like "render as geometry" or other modes that make it work without specific support or not, so all I can say is no specific development has been done for it, but how well it works without specific support I don't know, sorry.