Since the word has leaked out on the street, even though Funi hasn't made these dates 'officially' public yet (because they are off the current published release schedule), I'm going to go ahead and confirm that the dates for both Chobits and Rosario+Vampire have been changed again.
Here's the new dates:
Chobits Complete Collection DVD Boxed Set (Eps #1-24) (Classic Anime) - Apr 26th to May 10th
Chobits Complete Collection DVD Boxed Set (Eps #1-24) (Classic Anime) (BLURAY) - Apr 26th to May 10th
Rosario+Vampire Complete Collection DVD Boxed Set (Eps #1-13) - May 17th to Jul 19th
Rosario+Vampire Capu2 (Season 2) Complete Collection DVD Boxed Set (Eps #14-26) - May 17th to Jul 19th
Remember these dates are subject to change again, and could change in either direction.