AnandTech has got their hands on a pre-release sample of the Intel Lynnfield and ran it through a couple of tests, you can check it out over here. Here's a snip from the conclusion:
Lynnfield, today, looks very good. Enable all of its turbo modes and I believe Intel has another winner on its hands. When Nehalem first launched I complained that the move to a smaller L2 cache kept it from significantly outperforming Penryn in some applications and games. With Lynnfield's turbo modes I believe my complaints will be addressed; need better performance in games? Turbo mode solves that. In many ways, Lynnfield could end up being even more significant than Core i7 ever was.
Penryn was always good, Bloomfield was nice to talk about but Lynnfield may end up being the one you marry.