The nay-sayers were misinformed! Design Review is not being actively developed, but the DWF format is not changing and Design Review continues to be compatible with the latest products that make DWFs. I don't expect that to change anytime soon.
That said, you can do a lot of the same collaboration(and faster, more efficiently) with a cloud based tool like the one we are working on here.
I'm curious if you have tried the pin commenting available on 360.autodesk.com. It only works on 2D documents at the moment, but if you think this sort of thing would be good in a 3D file it would be great to hear about how you would like to see it work.
If you have any other ideas for features you would like to see in this product, be sure to post them here:
http://forums.autodesk.com/t5/Autodesk-360-Tech-Preview/idb-p/3014Thanks,
Tony
Antonio Licon
Product Manager, Autodesk 360 Customer Success