X-bit Labs has posted an article on their site that Western Digital is going to release a HD with 200GB of space :
Western Digital decided to answer Maxtor with releasing HDD of extremelly high capacities. The company unveiled another Drivezilla series drive with capacity of 200GB and 2MB buffer. In addition, the manufacturer plans to ship Caviar SE hard disk drive with 8MB buffer.
Pricing and availability questions are not touched upon. Keeping in mind that there is nothing new in the new drive, Western Digital can start the actual sales in a very short time.