It's clear that Haswell has been designed with mobile devices in mind. For products like (convertible) Ultrabooks, Haswell has useful new improvements, such as the lower (idle) energy consumption. Haswell is also the generation which finally allows Intel to compete with AMD when it comes to integrated graphics.
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips