The pricing structure from what I can find:
Mira Monitor $5,800
Mira $15,000
Ankaa $26,500
Mira Grand $34,500 (NEW VERSION with new midrange - old was $29,500)
Anquila: $44,500
Altair: $89,500
Hyperion: $91,500 (not sure of latest price)
Arrakis: $165,000
The Mira Grand has been updated, but the Mira and Mira Monitor will remain the same. The new offerings have midrange drivers that are made by Rockport which are claimed to improve on the audiotechnology drivers found in Mira Monitor, Mira, and old Mira Grand.
Having listened to the Mira Grand, best word to describe is seductive. Midrange is natural, unlike anything else really. Sidefiring woofers disjointed the sound somewhat, not quite as seamless and "cut from the same cloth" sound I was hoping for. But again, mids unlike anything else, seductive. Best suited for acoustic and voice, you appreciate the sound coming from Rockport more than anything...
These are just my experiences, your mileage may vary!