According to this paper http://www.iac-paper.org/abstractcd/2007/abstracts/data/pdf/abstracts/IAC-07-A3.2.04.pdf JAXA is studying a Hayabusa-2 for launch around 2010 to sample a C-class asteroid and a larger probe to sample a "more primitive" body (to me, that means a dormant or extinct comet).
And incidentally, abstract for the IAC2007 are now available on http://www.iac-paper.org/abstractcd/2007/
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