Fudzilla reports that a pair of new drives will be launched next month, and this page on Intel's Website confirms that the new 510 series is designed for the "enthusiast consumer client PC." Read speeds on the new drives will leap to 450MB/s (from the X25-M's 250MB/s) and write speeds will accelerate to 300MB/s (compared to the X25-M's 100MB/s).
As is usually the case with SSDs, costs for the 510 series will not be cheap on a per-gigabyte basis. A 120GB drive will cost $279, while a 250GB version will set you back $579. Nonetheless, enthusiasts with deep pockets will be happy to spend the scratch for that kind of performance.