Cisco has released Visual Netwroking Indes (VNI) forecast 2011-2016 for M2M. According to that report, M2M traffic will grow 22-times betwween 2011 and 2016. M2M traffic will account for 5% of total mobile data traffic in 2016 and number of M2M modules is expected grow 5.8-fold to 1.9 billion in 2016. Here is the link to Cisco’s M2M forecast.