I cannot recall if we've discussed this or not, but I think we need to determine which formats we plan to eventually allow these virtual cards in. The reason I ask is because figuring that out will aid us in designing the cards (and the sets) themselves.
Here's a way I think we could organize it that I think would work nicely.
Note: Almost all the cards we currently have selected for Virtual Set #1 are Fellowship block cards,
so deferring the few that are not until Virtual Set #2 or 3 should be reasonable.
Example:
[Virtual Block #1: "Remaking the Worst (or something better sounding)"]
Virtual Set #1 would be virtual versions of Fellowship block cards. (Allowed in FOTR, TS, and Movie)
Virtual Set #2 would be virtual versions of Towers block cards. (Allowed in TS and Movie)
Virtual Set #3 would be virtual versions of King block cards. (Allowed in Movie)
[Virtual Block #2: "<insert theme here>"]
Virtual Set #4 would be virtual versions of Fellowship block cards. (Allowed in FOTR, TS, and Movie)
Virtual Set #5 would be virtual versions of Towers block cards. (Allowed in TS and Movie)
Virtual Set #6 would be virtual versions of King block cards. (Allowed in Movie)
...