Amarok 2 was released on December 10th. I have KDE 4 on my experimentation laptop, so I tried it. I don't like it. Aside from technical glitches and missing features which will hopefully be added again someday, the whole idea of it is wrong.
Amarok 1.4 is good because it gives you extremely dense, detailed information about your songs. I've got 13 columns of information in the playlist pane and I look at them all. Score, Rating, Play Count, Year, Disc number, Track number... I like to see these things. I like to sort by these things. I like being able to see the bitrate of my MP3s at a glance. I'm a nerd, that's why I'm using Linux in the first place.
Amarok 2 on the other hand has a tiny little column down the right hand side to display song information. It groups things together so you don't need as many columns, but it's nowhere near what Amarok 1.4 gives you. Bad bad bad.
On the very rare occasion I want to see lyrics or something, in Amarok 1.4 they're hidden away in tabs I can ignore most of the time. This is good. The majority of my window should be devoted to DISPLAY SONGS.
Instead, in Amarok 2, half of the GUI is devoted to this center pane to display "context" information. This is bad. I don't care about browsing web sites to buy music, or browsing Wikipedia from inside my music player, or "discovering" new music. And if I did care, I would use a WEB BROWSER. A music player is not a web browser. If I want to discover music, I'll go use last.fm or some website that's devoted to it, using Firefox. If I want to see a Wikipedia article, I'll look at Wikipedia in Firefox.
Music players should play music, and web browsers should browse websites. When you have one enormous program that tries to do both, it just ends up doing both poorly. This is nearly universally true and it's certainly true in what I've seen so far in Amarok 2.
KDE 4 isn't even usable (as of KDE 4.2 beta1) and Amarok 2 fits right in, unfortunately. I hope they give us back some of the things that made Amarok 1.4 great. Or else that Amarok 1.4 keeps working for a long time.