According to Korea's daily IPD newspaper, the tablet's release has beenpushed back to June, but for a good cause.
The dual-core processor is being replaced with a quad-core Exynos processor, most likely the 1.5GHz Exynos 4412 chipset.
The Korean newspaper said that Samsung decided to go with the quad-core Exynos processor as a way to make the tablet more competitive to the new Apple iPad. The A5X processor in the latter tablet has outperformed even the Tegra 3 when it comes to graphics so Samsung is hoping that by bringing in a higher-spec'd chipset, it will be in better shape to compete with Apple's third-gen tablet.
You can take a look at the Samsung GALAXY Note 10.1 in action by clickingon the video below.