Storm Island content update now availableOriginally Posted by: HeliosT10 
Hi all,
First of all, many thanks for your patience and understanding whilst we got this sorted. We appreciate it.
We're now starting to see reports from players that the Forza Horizon 2 Storm Island update is now rolling out to players. If you've bought the expansion, once the update has finished you should now have access to the new content. We really hope you enjoy it!
(1:15pm Pacific time)
If you do not immediately see the content update prompt when you start Forza Horizon 2, try a hard reboot of your console (or wait a bit as the update may not arrive at exactly the same time.
Avoid game launch issues by allowing the content update to install completely (nothing in your My Games/Apps Queue) before attempting to load the game.