Yes, but that must be processing speed, not network speed. Apple can't do anything about improving network speed... that's up to the carriers.
4G is hella-fast on Verizon. With LTE on my DL speeds are around 14 meg and upload is around 5 meg. I think at home I get 10 meg down / 2 meg up.
3G speeds are like 10% of that. 1 - 2 meg down and 300 - 500kbps up.
