Yea, Start they are starting from sctrach.. They said they will be using a totally new decoder in Winamp3, im not sure if its included in this version.. Chances are your plugings will not work, with this alpha. They should work eventually.. I have only tried the visualization ones that ship with it.
The playlist seemed to be working for me.. I just tried it for a few seconds though...
Dunno if they know that its out over at the nullsoft forums..