There are a lot of reasons why it’s unlikely that the next iPhone won’t boast true LTE speeds. For one thing, the national coverage for LTE is virtually non-existent. For another, first-gen LTE chipsets are by Apple’s own estimation far too juice hungry to go into the iPhone.
If you needed any more cold water dashed on your hopes of an iPhone 4G in September, though, consider iSuppli’s latest report. They say that an LTE chip in the iPhone would make it the bulkiest and most expensive iPhone yet.