I think he is probably having a good time not telling us! Seeing which journalists make up the most improbable story. Or perhaps he thinks the silly season is more fun with another unknown.
When he does announce his intentions I think he will say very little:
Q: "Mika, you are having a year off, blah, blah, you are a double world champion, blah, blah, you are now a father, blah, blah, Have you made your mind up about next year?"
Mika: "Yes" pause, smile.
Q: "err, blah blah blah, stutter, are you coming back?"
Mika: "
"