See what happened to @vashpan and his (great) game Commander Pixman, he set the release date for the 29th but got approved on the 27th, guess what happened, his game was released on the 29th BUT the date was 27th, so that affected his position on the "Newest" list games. That's totally unfair.
Weird enough, I had the same situation a month ago, but my release date was couple of weeks after approval date, but on my case my game was release with the correct date and was on top of the "Newest" games.
I think this is serious, as it can badly impact on sales, as we all know those few days on top of the new games is our only chance. Any more experiences?