A missing feature is there. like till wmp 10 there is total time of listed songs or movie in list pane but in wmp 11 it is missing. and i think .dat file timing only visible during play back of the file. well better if they assosiate .dat as vcd player.
and give some rest to k-lite mega codec maker.
an improved plug in visual managment control, like wmp library type where they can search plug in from wmp by typing in search box. and install from there similar like as firefox do in add on install in firefox 3. but more cooler and fluid style look in wmp 12.
using gpu rather than cpu for visulization as i see wmp bliss 10 usage >10% cpu in a high end quad core machine. but there is a dx10.1 gpu available.
smooth zoom scroll etc.
horizon scrolling support for media library (i not see it in wmp 11)
bole toh ekdam 3d look sky fy filmo ke mafik. and better a gadget of wmp 12 in desktop.
and last but not list...
key assignment shortcut like winamp.