I was having a thought in regards to these two spells and some of the complaints I have been reading about. Why not just swap the two spells in MOP?
Shadowy Apparition: This spell becomes our CD burst spell, that shadowfiend is now and would read like this:
Your targets shadow consumes them ( some cool animation like from the movie ghost? The target takes the form of the new shadowform glyph while under its effect? ) and it causes x amount of damage every 3 sec for x amount of time. The apparition returns X amount of mana every time it deals damage.
Shadowfiend: This spell becomes the new apparition spell and uses the current shadowfiend model.
Releases a shadowfiend at the target causing X amount of damage. Costs 1 shadow orb.
Major Glyph: Your shadowy apparition attempts to drag the target into the shadows causing the target to move 50% slower.
Minor Glyph: Your shadowfiend takes the form of a Care Bear, Hitler, Range Rover Sport, Ru Paul, the trade chat girl from youtube, Murlock, Ben Bernanke, Adriana Lima, etc.....
You get the idea.
Just a thought on the current MOP situation....