I hope they are also going to add support for left/top alignment of the icons (the classic way), for removal of left&right margins in centered alignment (Mac way) so places to the left and right of the icons would be free screen space rather than empty panel area, good support for horizontal panel placing, turn system icons (unmount device, network indicators, sound volume&output control, keyboard layout indicator, clock and calemdar etc) into first-class panel icons rather than tray icons (they just look ugly in case of horizontal panel placement).