Here is the response I got from Disney when asked when we can start booking California Grill. According to this we should be able to book our ADR's now! Has anyone tried it lately?
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Thank you for contacting the Walt Disney World® Resort.
From time to time, we refurbish our offerings in order to continue to
provide a magical experience for our Guests.
As a part of that effort, California Grill will undergo a refurbishment
beginning February 2, 2013 and continuing through late summer 2013. The
restaurant will be temporarily closed during that time (please note,
dates are subject to change).
California Grill should be open by that time frame for you to begin
booking at the 180 days. Today, April 2, we are booking for September
29th.
We look forward to seeing you Real Soon!
Sincerely,
Bart Maggio
WDW Online Communications