According to 43Rumors, a dpreview reader said “USA Panasonic Customer Service is now confirming that the GH3 will be here within weeks”., We can expect the announcment on Jan 10 at CES show in Las Vegas.
At Sep 28 2011, Panasonic has confirmed to TechRadar that there will not be an upgrade to the GH2 by the end of the year, later Mr Uematsu said that Photokina 2012 would be very important for Panasonic.
I believe will coincide with Photokina like the GH2 did in 2010, The GH3 is expected to feature better sensor, 1080/60p and a much better screen and EVF.
See more – New Camera Coming in 2012 [Rumor]
people that use the gh2 that are waiting for the gh3 could be along time for panasonic to say when it wil be coming out 2014 becouse they are tacking to long