Ok, here is the answer.

Pa50 is a new KORG product, presented at the Music China Fair (Shangai, 15-18 october 2003).

Music China Fair is the asian counterpart of Frankfurt Messe.

On 16 october 2003, in room 2000 at INTEX Shangai, KORG demonstrated their new products (PA50 and PA1XPro).

Go to http://www.messefrankfurt.com.hk/musicchina.asp for details.

Hoping that KORG will let us know something more....