Hey James, think there'll be a few of us down that way then!
Have done Mt Arthur itself twice now in winter, and its fairly easy then - poled route pretty much all the way up, and another one across horseshoe basin towards Gordon's pyramid and the tablelands. So shouldn't have any issues in Summer! The tablelands is quite a nice area to explore too, though haven't done a whole lot there - but I think its all pretty easy walking...
Kieran,
Co-Treasurer