I heard an official saying months ago that the speed can reach between 5 and 10 Mbps with IMEWE!
It all depends on the service you are getting. Through 3G it could be up to 21Mbps or even upto 84Mbps. this depends on the Tower you are getting the signal from, and the plan provided by the ISP
Also the same thing for DSL, regardless of the technical issues, and if your house is near the CO, there is no plan that can give you a speed of 20Mbps
By introducing IMEWE to the grid. The download speed over DSL will reach its limit (512kbps=64KBps) per user. as long as the link between the COs is not full!
What I meant by that, in the current situation, if you have a DSL plan of 512Kbps, your transfer rate would be around 40 ~ 50 KBps, and by introducing the IMEWE it should reach its limit of 64 (512/8) KBps