The new iPhone is expected to be 4G LTE enabled and will feature a LTE radio. The Smartphone will may be launched sometime in the next half of the year 2012. Until then there will be 45-50 million units of 4G LTE handsets would have been already sold.
Though earlier expectations and calculations said the sales of a 4G LTE handset will go 25-30 million units only. You may look forward for a faster processor and larger screen resolution and size in the next iPhone.
There have been also reports claiming the new iPhone to be in absolutely new design and new set of antennas. We are hoping Apple will give a metallic finish to this new phone; we will be sure by the fall.