IPhone 5 broken glass replacement

The digitiser is built into the glass with epoxy, so no, there is no way to separate it.

We tried. If you look at the lower left corner of the LCD you can see the scarring of our attempts to seperate the LCD from the digitizer.

^{Source: iFixit: Can I separate the glass from the LCD screen?}

There is firmware on all replacement parts. I'd just wait until iOS 9 comes out in September to make sure that the screen is compatible with the new software, just make sure you can return the screen. However, there are some better vendors, like iFixit, that would likely sell screens that will likely be compatible with iOS 9, just be prepared to pay an arm and a leg.