No word about price though.
…developers  DataCore software, Division M, and StableBit are all working on add-ins  for Windows Home Server 2011 that will bring the feature back. The  first of those, called Drive Bender from Division M, is slated to arrive early next week, with StableBit’s DrivePool add-in, and DataCore’s Storage Virtualization to arrive later on. All three solutions bring back the capability to  pool together multiple drives, with DataCore’s solution promising to add  in new features like drive mirroring.