I got a confirmation from a highly trusted sources that Sony set the release date for the A77 successor. It’s going to be released in early 2014. The source also confirmed that this will be a full mirrorless A-mount camera (no SLT tech). I am working on the specs right now and hope I can get confirmation from other sources too soon. I have been told it has a slightly new design too (still DSLR alike).
P.S.: The A77 will be announced along a Full Frame A-mount cameras (also mirrorless).
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Reminder (SR = Sonyrumor):
SR1=probably fake rumor
SR2=rumor from unknown sources
SR3=50% chance it is correct
SR4=rumor from known sources
SR5=almost certainly correct!