For there to be an actual keyboard on an iPhone Jobs would have to eat a lot of crow. He hates to do that, and will fight an actual keyboard until the end.
IMHO, the new phone will not change at all visually (minor trim, maybe), but it will change by adding new tech (3G, GPS?, more storage, maybe a faster/more power efficient proc).
Jobs is more likely to backtrack on styluses for an iTablet design, than add a keyboard - the original brief for the iPhone was more along the lines of a phone with internet capabilities to be used on the go, not a mobile long letter writing device.