They need to definitely make a kneeling Vader Hologram and also spirit of Ob-Wan with his hood on to go with my Hoth/Tauntaun scene.
I think the best a guy could hope for, in regards to a kneeling hologram Vader, would be a holographic type figure articulated well enough to pull off the desired pose.
As for a spirit of Obi-Wan, would a figure done up akin to the spirit of Anakin in the TAC be up to your standard? I could see this one happening.
Someone above mentioned a ball jointed neck for a Vader. There actually is a couple ball joint type necks on at least two Vader releases. Rather than a true ball joint, the joint used enabled the head to look up and down as well as side to side. Hasbro abandoned this joint with the various removable helmet versions. It wasn't a bad joint though. It really offered all the movement ever seen in the films as we never saw Darth Vader cocking his head to the side. Matter of fact I doubt the prop mask would have even allowed such movement.