End of year (holiday) debuts are pretty commonplace.
After picking up the Hero in October, we saw the Nexus1 and Droid right on its heels. Not that they were on Sprint, but there seems to be a quickening pace since then.
Not that I necessarily believe all of what the "Sabor" is rumored to be, but no part of me doubts for a second that the Evo will not be the latest and greatest by January. Not even on Sprint. Particularly since we've been told we're supposed to be seeing 2ghz processors by then.
I'm not nearly dissatisfied enough with my Hero (thanks to root and flipz) to run out and get the Evo or anything else in October. I'll just end up regretting it in two months.