I think that auto-latching trunk isn't on the 5th, I bought wheels off a 5th gen owner and when I went to close the trunk he seemed very puzzled and wondered if my trunk was closed.
I have a 2009 Limited with a V6 with the multi-mode 4wd which allows me to run in 2wd. The 2010 Limited has a V6 with all time 4wd. No 2wd available on this one. The 2009 is the last of the LTDs with multi-mode 4wd.