I don't have a 5th gen, but if history is any indicator, it might be! Most 4th GENers know (at least should), that all factory radios are plug and play for 2003-2009. However, it should be noted that if you have JBL, you have to stick with a JBL powered HU and vice versa. From what I've gathered, the radios on all year 5thgens look about the same.
PS: I'm not aware of any previous information on the 5th gen radios (I'm hardly ever on that part of the forum).
Good luck