As is typical, the UK Korg site has more detail than the US.
http://www.korg.co.uk/products/professional_arranger/pa588/pa_pa588_specification.asp

Poly = 80, Weight = 51.5 lbs

There were some previous posts about how Korg has a way of better utilization of polyphony so 80 is not a problem. We'll have to see once it's released. Weight has yet to be confirmed.