The Galaxy Tab 2 (10.1) was originally reveald on the MWC 2012 earlier this year with a Dual-core processoron its specs, Samsung is rumored to swap this originally planned dual-core processor in the tab with a Quad-core endeavor, so this will inevitably mean some retooling and a bit more testing, hence the launch delay.
Quad-core is good for marketing purposes and as far as production costs go it is not much different than dual-core, especially if Samsung uses its own Exynos processors, but even if it has some Tegras lying around, the difference in assembly price should be insignificant. The 10-incher is codenamed Espresso and apparently scheduled for June launch.
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