Apple has been looking at alternatives to supply the chip but have chosen to stick with Samsung's 28-nanometer processing technology. neither Samsung nor Apple have commented in regard to this information.
Rumors point towards the iPad 3 adopting the retina display from the iPhone, so LG who built the retina displays for the iPhone 4 are likely to continue to provide the display panels for the new iPad and iPhone, however LG's spokesperson Sohn Young-june declined to confirm this report.
source - Korea Times