So far (and I am assuming that we are staying on the Zondervan Counterpoints series for the 14-week duration) we have had posted on Twitter for the 50% weekly deal:
Jan 30th Evaluating the Church Growth Movement: 5 Views 
Feb 6th Five Views on Apologetics 
Feb 13th Five Views on Sanctification 
Feb 20th Five Views on Law and Gospel 
Feb 27th Four Views on Eternal Security 
Looks like we are going down the list on the product page:
http://www.logos.com/product/8182/zondervan-counterpoints-collection
If that is the case, has anyone else noticed that one title has been missed:
Exploring the Worship Spectrum
Hopefully this will be picked up before the end of the series is reached and labelled as 'completed'