The teaser shows a bit of the extra content of the game. Something that is said to be about another two hours of gameplay showing and letting players go through some of the events leading up to Resident Evil 5. Like all the Jill flashbacks that Chris has in the game. A nice little bit to help flesh out an already overwhelming story of Umbrella and their deadly Bio Weapons research company.
To go one further, this version is also being placed out there so that PS3 owners have a huge title to play with their new motion controllers that Sony is working hard on. Meaning, yes this will have the new motion controls for the PS3 version of the game and it is slated to come out this upcoming Spring. At least in Japan. There is no word if Natal is being taken into account for this re-release or not, but I don't think that Capcom would hamstring themselves like that. Meaning I'm sure there will be announcement for it working with Natal soon.