As the new GPU is included in the CPU, it is also manufactured in 32nm and shares the fast level 3 cache with the CPU cores (using a new ring bus). The i5-2410M offers an integrated graphics card ( Intel HD Graphics 3000) which is clearly faster then the older Intel HD Graphics in the Arrandale CPUs.
The most noteable improvements is the improved Turbo 2.0 and the integration of the graphics card into the 32nm CPU core. Sandy Bridge is the evolutionary successor of the Arrandale architecture.