I compared 3 iPad 2's side by side at the weekend and also against my 1st gen device.
All 3 iPad 2's exhibited some form of light bleeding - some worse than others but only under extreme circumstances i.e. brightness up high in a dark room. For the record, the 1st gen also displays a small amount of light bleed on full brightness but not to the same extent of the send gen.
The other thing I noticed is the colour balance of the new screens - a couple of them showed a warmer colour balance with a real yellow tint across white at lower brightness levels. They actually made the 1st gen have a blue, cold look to whites. One of the 2nd gen screens did look closer to a brighter white than the others though so I'm guessing there are a few screen manufacturers being used for the 2nd gen.
At the lowest brightness level, the iPad 2 actually looks quite dull compared to the first gen although when brightness is up full, the screens are much closer in colour balance with the 2nd gen just having a very slight yellow tint. At 100% brightness, they all appeared about the same brightness.
Seems there is some real variation in the new screens but to be fair, the majority of colours and certainly viewing angles etc. seem identical across all the iPads I tested including the 1st gen.