What would you like to see out of the finale for the Isis series?
Personally, I would like the Isis V to be the most difficult of the series-combining both the mechanical/positional challenges of the Isis 1+2 with the brain teaser challenge of the Copernisis.
I'd like to see the Isis V in two stages: one outer box which requires the 4 keys to unlock, then the actual Isis V puzzle inside. The keys would align a series of numbers or code on the inside when turned to the 'unlocked' position which would be needed to either register the Isis V or be needed to solve it. This would also serve as an extra security step to help ensure only the worthy have access.
Perhaps a real-time online counter showing the number of people worldwide who have registered an Isis V and are working on the puzzle. The site could also show the number of people who have solved it. A running timer could add some excitement to the race as well. Even if you aren't the first to solve it, it could be quite exciting to see you are in the top 10 or 50.
I realize there are limits to how complex a puzzle can be but so far we have seen a sphere, pyramid, disc and rumors of a cube for the Isis 4. I would love it if the Isis V had a more exotic design worthy of the crowning jewel for the series. A crystal-shaped design would look very nice but may not be possible.
The name should also be chosen carefully-like 'The Omegisis' to represent the 'End' of the series.
What are your thoughts on what you would like to see?