What I do hope is that the greatly increased battery size is something which will stay on for future devices, even if a lower-power LTE chipset is used. An extra 10% weight isn't a big problem, IMHO, compared to the benefits of increased battery life.
I feel differently. Added battery time is great, particularly for peace of mind, but for users who charge each night it's probably already rare that they run it completely down with normal use. Weight and thickness, however, affect everybody. The feel of the device in the hand is paramount, it's evident in every interaction and can dictate usage patterns. iPad 2 was heavier than I would have liked, often requiring a prop for long form reading, so the weight regression in the new iPad is disappointing. With the only real changes for this year having been made in service to it, that screen had better be revelatory.