v2.5 adds SUA (Special Use Airspace) information, High Enroute IFR charts and some additional WAC charts to extend sectional coverage charts.
Reviews for the new region select has been less than satisfying.
Remember: Its trying to download a LOT so make sure you use your fastest connection possible. In most cases that should be wifi, but if you know your wifi broadband connection is slow, please try 3G as well and check which is faster.
It should take about 7 minutes to download 450Mb, and about 14 minutes for the 900Mb.
The first download bar is download, the second bar is unzip. If your wifi is faster to download than the unzip process the first bar should move faster than the second bar.
Don’t take the app offline until both bars are at 100%, but you can safely take the app into no connectivity areas after the first bar has completed.