Version 188.8.131.52 has many significant improvement over version 184.108.40.206. The most important part is the support of Machine Learning Library.
For a detail change log please visit http://www.emgu.com/wiki/index.php/Version_History#Emgu.CV-220.127.116.11
Please note that OpenCV 1.1pre on windows requires MSVCRT 8.0 SP1. You have have to install it prior to using Emgu CV 18.104.22.168
There is also a discussion forum available at http://www.emgu.com/forum/