The ICC is not going to spend money on preparing the wickets and all the responsibility goes to the team hosting the tournament including the preparation of pitches. Not sure there will be a stage when toss will be automatically given to the visiting team as toss is a major part in cricket according to the pitch condition and you cannot mess around that.
Well... that was just a proposal made by some of the ICC officials a few years back. It triggered serious debate, but in the end there was very little progress. And if I remember correctly, the immediate reason was that some of the Asian countries prepared tracks that suited their style of play, when either Australia or England was visiting (don't exactly remember which team raised the complaint).