There is a newer text.
This looks like a fun book to read and the Greek is fairly easy but the story unfamiliar. Perhaps a reader's edition? I've extracted the pages of Batiffol's version into a separate pdf. It can be found at http://www.letsreadgreek.com/texts/jose ... senath.pdf.Christoph Burchard, "Ein vorläufiger griechischer Text von Joseph und Aseneth" in Gesammelte Studien zu Joseph und Aseneth: Berichtigt und ergänzt Herausgegeben mit Unterstützung von Carsten Burfeind (Studia in Veteris Testamenti Pseudepigrapha 13; Leiden: E.J. Brill, 1996), pp. 161-209; also available in Dielheimer Blätter zum Alten Testament 14 (1979), pp. 2-53; & 16 (1982), pp. 37-39
Burchard's eclectic, longer text is the basis for his English translation in Charlesworth's Old Testament Pseudepigrapha (see below). Quite the best place to access Burchard's text is in the recent Gesammelte Studien listed first here: it is easier to get hold of this and it is in computer format with diacriticals and so on. But note that the text is also available in the following volume.