There are rumors that Samsung is set to release a new Galaxy S II variant (code named Celox) with LTE. The interesting bit is that it is said that this phone will sport Samsung's new Super AMOLED HD display rather than the Super AMOLED Plus used in regular S II phones - and that Super AMOLED HD will use PenTile matrix again.
Galaxy S II
So if Samsung goes back to PenTile, this might explain the resolution increase, although it will still be unrealistic to expect an HD (1280x800) resolution on a 4" display - even with PenTile, as Samsung will not be able to move beyond 200ppi using their current FMM technology. In any case, it seems rather unlikely for Samsung to go back to this technology after telling us that normal matrix is better in Super AMOLED Plus displays...
Still, things are starting to get interesting. It may be that the Super AMOLED HD will be used for tablet displays as we speculated before, or it may be that this display will feature higher resolution (but not really HD) using PenTile matrix.
