If Apple’s development cycle for iPhone OS 4 is staying true to major releases that came before it, we should be quickly approaching the final build. Apple rarely exceeds 6 or 7 Beta releases — so chances are, we’ll see OS 4 ship out to everyone within the next month or so.
Folks much smarter than yours truly are hard at work tearing apart this latest Beta for all the hidden morsels, so we’ll let you know if we hear anything.