Well, it looks like Broadwell even be a more significant upgrade for laptops since Intel doesn't plan to make it available for desktop systems. Even more reason hold out of the Broadwell Retina MacBook Pro:
The report from Fudzilla, using unnamed sources, says that Intel's new plan is to release an all-new processor design for the desktop market every two years. In 2014, the report claims that Intel will offer a slightly improved and optimized Haswell CPU for desktop PCs. The next major new design won't come until 2015, when Intel plans to launch Skylake, which like Broadwell will use a 14-nm manufacturing process.
Source
The report from Fudzilla, using unnamed sources, says that Intel's new plan is to release an all-new processor design for the desktop market every two years. In 2014, the report claims that Intel will offer a slightly improved and optimized Haswell CPU for desktop PCs. The next major new design won't come until 2015, when Intel plans to launch Skylake, which like Broadwell will use a 14-nm manufacturing process.
Source