Everyone is excited about Haswell. After all, if you can extend my battery life for over 50%, then who's going to want the older product? Intel Core processors on most ultrabooks, tablets, and laptops are currently their 3rd generation processors. You can tell by looking at the number that follows the i3, i5, or i7.
Let's look at this example: Intel Core i7-3667U Processor
The 3667U indicates that it's a 3rd Gen processor. Notice the 3 in the front of the 3667U?
Here's another example: Intel Core i5-3427U Processor
The 3427U indicates that it's a 3rd Gen processor.
The older 2nd Gen processors had a number that starts with a 2. Here's an example:
Intel Core i5-2467M Processor
So, naturally the 4th Gen Intel Core processors (Haswell) will start with a 4 like this:
Intel Core i7-4765T Processor
Intel Core i7-4670R Processor
Intel Core i5-4570S Processor
We're up to 4th generation Intel Core processors and in my opinion, we're finally seeing a major leap in battery life. Intel Atom significantly extends battery life, but it does this at the expense of performance.