I tried the SMC reset as well. Not sure whether it affected the temperature management on my MBP. However, I wouldn't consider my case representative because after the replacement of my toasted NVIDIA chipset, the fan control did not work as before - it became much less responsive when the temperatures were rising inside my MBP and hence the risk of it getting toasted again was pretty high. Because of that, I forced smcFanControl to always run at maximum fan speed (i.e. 6,000 rpm). It made my MBP noisy but at the same time, the temps were kept pretty low on average (c. 45ºC, which is pretty safe, I reckon). Also, whenever I had to do very prolonged and intensive tasks (e.g. TimeMachine full backup, OS upgrade etc), I always placed an ice pack under the laptop. I know, it sounds pretty poor but that's the reality with this crappy chipset...
Now, to the point. I have isolated two main causes for the rise in temperature:
(1) the initial indexing of Spotlight
You can check whether Spotlight is indexing by just invoking it via Cmd + Spacebar - if it is indexing, it will show the relevant progress bar. There is an associated process called mdworker (metadata worker) and I think another one called mds (if you google it, you will find the details). Those processes take up quite a lot of CPU on my MBP when the indexing is taking place. After a few long executions, they now seemed to have died down.
(2) Mail
I have a lot of accounts in Mail and when I started it for the first time in Mavericks, it was ridiculously slow and unresponsive. Also, Mail used insane amounts of CPU for hours again, which apparently took place at the same time as the Spotlight indexing - you can imagine what the poor MBP went through. Again though, after hours of execution, Mail seems to have calmed down.
I am almost certain that the high temperature I observed on my MBP for all those hours (roughly averaging 67ºC with fans constantly at 6,000 rpm and icepacks under the casing) were correlated with the two above processing tasks. Now, that those tasks have finished, my CPU utilisation is pretty good and the temp has gone down to familiar values (c. 45ºC along with my blood pressure 🙂).
I'll be on the lookout in the next few days on this issue. I am particularly interested to see what will happen upon a few shutdown/restart cycles, especially when re-starting Mail.
It has been a much less than smooth upgrade (especially if you top it up with the iBooks disaster). We'll see.
Hope that helps and good luck.