We got hit recently from Pakistan IP's mostly registering as 24 year old females. After an update to 1.3.3 and I updated FoolBotHoneyPot which we use and takes care of 99% of our spam, things went back to normal. Not sure if they stopped or a change in FoolBotHoneyPot stopped them. Based on the logs from that plugin they seemed almost like human registrations but still had suggestions of automation.