We just recently saw a foursquare update bringing foursquare up to 1.8.1, and then immediately the next day it was updated to foursquare 1.8.2. Now we have found a new version floating around twitter that brings foursquare up to 1.8.3. There is no official word from Foursquare of an official new version yet, but that won't stop you from trying out a new version right? There are separate builds for Trackball/Trackpad and Touchscreen. Dont download the wrong version!