I haven’t forgotten Manga+Press. Just been very busy adjusting to a new job since August. I know that WordPress 3.8 is due out very soon and I will make every effort to assure that Manga+Press (both stable 2.7.3 and 2.8-beta) work with the new WordPress version. If I remember correctly, the last thing with Manga+Press 2.8 was completing Spanish language translation as well as some final testing.
Blog will be updated with additional notes and progress!