Yep, that's it. There were no changes at all to the Core Location Framework in the 2.1 firmware. There's quite a nice list in the Macrumors forum that points out the changes quite nicely. In addition to that, I have some other sources (that I don't want to quote here) that confirmed that there were no changes at all.
Too bad, but I don't think that we will see turn-by-turn before the next major release. At least, I'm still confident that there might be such an application before the end of this year, considering the recent firmware release frequency and also Christmas trade.
As always, hope dies last.