EXS 24 Logic Sampler Users Group

Hello all,

I'm new to here. I'm planing to buy EXS24  on ebay. Could anybody tell me 
what's the main difference between EXS24MK I and EXS24MKII??  
Can MK I version 1.0 be upgraded to MK II??? 

I've searched the emagic web site, but with no luck to find the answer. 

Thanks in advance.