Thought I share my knowledge:
ZeuS Gameover 1 appeared in the wild in September 2011. It already had a DGA and the p2p algorithm. This version was not affected by the takedown by FBI & friends from May 2014. Yesterday it had still 1.169 infections (source: Virus Tracker).
ZeuS Gameover 2 was released in July 2012 after I published here (a few posts up) the DGA - the criminals changed it. In version 2 they also slightly changed some P2P commands and advanced it (secured it against crawling/disruption). It had at peak over 140.000 unique infections per day. The FBI & Europol takedown was about disrupting the P2P botnet (together with vu.nl and other researchers), taking down existing C&Cs and seizing all DGA domains (I have heard until 2017?). The DGA generates 1000 domains per week, all now pointing to a FBI sinkhole. They apparently charged the original ZeuS author (in the legal documents it states "slavik") but who knows whether he is also the ZeuS Gameover author (the source of ZeuS leaked in April 2011).
ZeuS Gameover 3 was released a few days ago, it has no p2p algorithm no more and again, a new DGA. In this new variant we only see 83 infections so far but that is expected to obviously go up.
Here are the global ZeuS Gameover infection statistics over the time from 2012 - 2014 today.
ZeuS Gameover Global Statistics 2012 - 2014 all versions.png (79.73 KiB) Viewed 602 times