after the island of isola, what happens next after solving all the puzzles? shouldnt i be taken to another island???

apprantely nothing. I am guessing there will eventually be a second game to purchase.

After completing all 16 puzzles/milestones, you have basically won the game. The what to do after is up to you: 1)continue playing, 2)start over on normal or hard levels, 3) add your own type of difficulties as mentioned in other threads. Read though all the differnt threads where this question has come up and you'll get a lot of ideas of what to do now, well other than waiting for the next installment.