From a plugged-in reader last week:
[E]ffective date of the conforming limit increase, it’s going to happen 3/14 (not public knowledge yet).
From a plugged-in reader today:
My mortgage broker just called me and told me [he] had one provider (indymac) who was now providing CA jumbo loans under the new limits ($700k+ vs $417k). He said the spread between the new Jumbo rates versus non-conforming (<=$417k) is 50 basis points as opposed to the 100-150 basis point spread a few months ago.