10kRPM IDE drives are minimum 1 year off.
They won't use them until 15,000 RPM SCSI drives are standard.
Right now Segate has one model of 15,00RPM and IBM has one.
They are still pretty cream of the crop even for SCSI.
When SCSI has 15,000RPM as standard issue, then IDE will bump up to 10,000RPM.
Edit: After all if IBM released a 10,000RPM IDE drive that would cut into their 10,000RPM SCSI drive sales quite heavily I would imagine (obviously there are still advantages to SCSI, but nothing as drastic as the raw speed).
So they have to make sure their high-end products significantly beat their mainstream so that they can justify (and get) the cost premium