They (Amazon, et al) keep changing dates, so the rumors keep changing, too. I was getting info from DVD websites, but that is now a couple weeks old. Plus, Samsung has apparently been asked several times in the last few days about their timing and they keep guaranteeing the 25th, like the videobusiness link above. So it looks like June is still on.

Sony just announced several titles will be pushed back to July, though.
[Link: dvdtown.com]