Honestly, if I'm the defense, this has gotta be awesome, right? Now, I'm not a lawyer, but I have watched Boston Legal twice, so that's basically the same thing, and what I'm hearing is these people want to get up on the stand and show the jury a video which either:

A) to the particularly inattentive, shows the victim clearly alive, or

B) demonstrates that even video evidence can be completely fabricated from whole cloth, and the opposition is more than capable of doing so to serve their own interests

Barring the staggeringly unlikely event that the defendant goes full-on Perry Mason Perp and outright says "hey, sorry I killed you, man" to the hologram, this seems like a pretty sweet deal.