Bloomfield will be introduced first and will be the high-end model, Lynnfield is a mainstream part and Havendale will be Intel's first CPU with integrated graphics.
The Bloomfield processor will be released late next year and will feature four cores, an integrated memory controller with triple-channel DDR3 memory support, Quick Path Interconnectand some other features. Bloomfield will use the Tylersburg and ICH-10 chipsets which supports two x16 PCI Express 2.0 slots.
The cheaper Lynnfield processor will arrive in the second half of 2009. This will also be a quad-core processor but it will only feature dual-channel DDR3 memory support and will have one integrated PCI Express 2.0 controller so you can't use it for more than one graphics card. Lynnfield will use the single-chip Ibexpeak chipset which will be a PCH (Platform Controller Hub). This chip doesn't use Quick Path Interconnect but the old DMI chipset interconnect.
Intel is also working on Havendale, a low-end part with integrated graphics but there will also be support for a PCI Express 2.0 graphics card. Havendale will be a dual-core processor.
Bloomfield uses LGA1366 while the other two processors use LGA1160.
Source: FUD Zilla