Core i5 and Core i3 details sound plausible.
Intel Roadmap Leaked, Shows Core i3, i5 Info : Read more
Intel Roadmap Leaked, Shows Core i3, i5 Info : Read more
Roadmap also shows a dual-core Clarkdale-based Core i5 with Hyperthreading that'll launch at the faster clock speeds starting at 3.43GHz, play Crysis and ramping all the way to 3.73GHz.
Japanese site PC Watch has details on a roadmap leak that details low-powered "S" versions of the Core i5 750 and i7 860, which feature a thermal design power of 82W rather than the usual 95W. These chips will supposedly run all four cores at 2.4GHz for the i5 and 2.53GHz for the i7.