From what I understand, the canberra bto bus service will not be
any ammendment of existing bus routes but will be a short trunk
plying from Sembawang to Yishun. Not sure if terminating at yishun
as limited capacity, might loop there.
There is in fact future bus stops along Canberra Link (between
the 504C bus stop and the Yishun industrial asrea/ emerald condo
one), one potential bus stop pair will be the one at Canberra MRT
and Canberra Plaza. Soruce:

(NOTICE the future bus shelter)
I would rather having a short trunk than a feeder / ammending
any services as it will be an added benefit for us.
But more services is needed .... especially one to chong pang
market will be appreciated.