Intresting topic this.
I personally would be against having another fixed Island as I don't think it would make much difference to the overall game.
However !!!!
I would love to see another Island, but one that is self made, like on operation genesis. The game many of use grew up on and loved dearly, yes it had many faults but some good points that Evolution lacks, like decorations, would the thing I loved most was been able to build parks on different man made Islands.
With the tec been used on Evolution It would be intresting to see people uploading there own self built Islands, Naming the Island, and been in full control of the Money, Building and Designing as if you owned the Island It's self.