The US is going from biggest to even bigger and commissioning a new class of aircraft carrier, the CVN-21. This will displace around 102,000 tons – compared to the British Invincible (22,000t) and the future French carrier (75,000t), this is indeed massive.
The current US aircraft carriers are built around a basic design developed 50 years ago, and allthough there are to be no radical departures in hull design (unlike the new British designs which are a radical departure featuring trimaran hulls and hexagonal flight decks), the CVN-21 will feature quite a few innovations, such as an electromagnetic launch rail, allowing for much more free space and electricity, a repositioned island and plug and play electronics, as well as better armour around the munitions bays and a better protected and more modern command centre.
The plan is to have the first one off the line in 2014.
This site has a comprehensive run down of the new features and is kept updated.