The iMac above is clearly has value to some professionals. 10GbE, 27" high gamut screens, and Xeon processors ... you have another vendor offering that "out of the box" in the $2-3K range?
http://www.hp.com/united-states/campaigns/workstations/z1_features.html#.T1i-XMwWqkI
This should have Thunderbolt options in the near future provided the connection actually gets adopted by the rest of the industry.
If it doesn't then it is likely to be very limited in development.