But with iOS5 you could encounter big problems as the iCloud function may delete cached maps in order to make room for "things".
What are the major changes? Will it by any chance graphically display TFR'S?
George
The biggie I think is the new XM weather overlay capabability. It will require a WxWorx WR-10 portable XM receiver and a Baron Mobile Link for a WiFi link. And an XM weather subscription, of course. If you go to the ForeFlight FAQ page on their web site, it covers the hardware required and costs.
Here's the link: http://www.foreflight.com/support/xm.php