Sorry for the double post, but...
... I also want to add that, in a recent interview in Russia, Komova did mention that she will retire after Rio. When Mustafina was presented with the question on her plans after Rio, she said she can't imagine continuing anymore... so it's not a definite yes to retirement, but quite likely. I'm guessing Afanasyeva and Paseka will retire too...
Looking at USA's MAG line-up for Rio, we'll most likely have the old guards from the previous quad with an exception of maybe one member... which means we could see retirement announcements from them. Then again, times have changed... we have male gymnast still staying in elite well into their 30s.