The auto geo-location feature will be the heart of the new app along with some new offerings called Place Snapping and Pick a Place. Both options allow you to more easily pinpoint and identify where you are thanks to the built-in GPS service for the iPhone.
The ability to see nearby Brightkite users will also be much appreciated. You can look at a map and see everyone in the area that you specify. It can be anywhere from local vicinity to several miles. Once you locate users you can even initiate communication and possibly arrange to meet somewhere.
There are a bunch of other cool things you'll be able to do with this new app such as track your friends and their activity feeds and locations, search for people, places and posts. You can also check your messages and post your photos and notes from your iPhone.
There's a slew of apps for the iPhone, but this one has been heavily requested by Brightkite users, so there will be a large user base waiting to grab this one. It seems to be a perfect pairing, so one wonders what's taken so long to get this out on the street (literally).