Details are light, but apparently SanDisk will be announcing a device called the Vaulter Disk next year, which will basically be something like an SSD intermediary -- a large bank of fast flash memory for speeding up platter-based drive access. Sounds a lot like the lovechild of RAMdisk and a hybrid hard drive, but we won't know more until a later date.
Update: We've got more details! It'll come in 8GB and 16GB sizes, and is intended to host the laptop's operating system and select user data, leaving apps, media, and everything else to the platter drives. So calling it an SSD intermediary is pretty accurate. It'll be available to OEMs early next year.