Perhaps, but I don't think so. Hasn't Geddy and Alex said all along that there is no Rush without all three of them? Replacing Neil isn't an option. No, I think this is nothing more than Neil reiterating that he's done.
Things could change of course but that would really be out of character for all three of them. The only way I could see them replacing Neil would be with Neil's explicit permission, and even then I'm not sure Alex and Geddy would be comfortable calling it Rush.