Apple says nothing new here, move along
The latest irritation circulating around the web having to do with the new iPad is a supposed revelation that the tablet doesn't completely charge to 100%. This "issue" surfaced after an analyst named Ray Soneira from DisplayMate noted in testing it when the battery indicator on the iPad showed 100%, the battery wasn't 100% charged.
Apple has come out and said that this is always how the iPad is charged, and nothing is changed from previous devices. According to Apple, the battery in the iPad charges to 100% as indicated on the battery life gauge, and then discharges slightly before recharging again to 100%. That is said to be designed specifically to allow the device to be plugged in as long as the user wants. I would assume the slight discharge is to keep the battery so overcharging and being damaged.