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The International Astronomical Union (IAU) have approved the following new designations and names of satellites of Jupiter (more info here):
Jupiter XXXIX Hegemone = S/2003 J 8
Jupiter XL Mneme = S/2003 J 21
Jupiter XLI Aoede = S/2003 J 7
Jupiter XLII Thelxinoe = S/2003 J 22
Jupiter XLIII Arche = S/2002 J 1
Jupiter XLIV Kallichore = S/2003 J 11
Jupiter XLV Helike = S/2003 J 6
Jupiter XLVI Carpo = S/2003 J 20
Jupiter XLVII Eukelade = S/2003 J 1
Jupiter XLVIII Cyllene = S/2003 J 13
If you want to know more about these satellites or Jupiter's satellites in general take a look here. Oh and more info about on planetary nomenclature can be found on this site.