When MUSES-C was launched originally, I emailed the team at HORIZONS to see if they'd add it to their spacecraft list. They said that this was an unlikely possibility, so unless JAXA do the ESA thing & start using it on their mission control big screens, I don't think we're going to see a Hayabusa xyz...
This little-known mission will be really cool to see results from, and the first time we've got samples back from an object other than the moon!