Cakewalk blog was shut down because they did not continue to pay the bills. The same may still occur for the forums, too, and who knows if 'transition' means transferring Cakewalk to a new owner who will keep things running or is it a step to end the company in a legal way. I have continued to use SONAR just as before, excluding sending problem reports, and wait for any news to be announced.
In addition to this place, two new forums were created quickly after the Cakewalk announcement. There are Facebook groups, too. No place will collect the Cakewalk user base as the official forums have done and the fragmentation is inevitable.