Back to the Gayle thing, I do not know any update available about his retirement but it's very much predictable that he will retire from ODIs if he can not perform well but for T20s - he is still non-replaceable I think and Gayle should carry on to it.
Posting here since this is the T20-related thread.
It's really sad that Gayle in not playing in T20s as he is the best player suited for this format. In ODIs, I understand that his performance is bad while for T20s, WI needs him as their previous performance against India was miserable. I've never seen a player in IPL who could hit 6s back-to-back like Gayle and once he sets in, he is capable of taking the score to 200+.