To be fair, you’re comparing the street price of a >10 year old monitor to the rrp of its newly announced successor with DSP. If you compare the respective recommended retail prices, there’s nothing out of the ordinary:
Rrp prices of the 120 series in Euros:
120 A : 729,-, i think the rrp at release was 719,-
120 D: 1195,-
new 120 II: 899,-
new 120 II AES 67: 1195,-
The 120 II will soon be available at 799,- or less soon enough I am sure, just like the 150 is already quite a bit cheaper than the rrp.