mergemaster and etcupdate

[tech-lists]

Hi,

I've used mergemaster for years like this:

1. mergemaster -p after the make installkernel step
2. mergemaster -Ui after the make installworld step

Although I've seen nothing announced making etcupdate mandatory, 
I guess etcupdate will be the new way of doing things. 
My questions are:

[a] what are the etcupdate equivalents of the above mergemaster commands?
[b] do I need to do any prep before running make buildworld, or with any
other step in the buildworld/installworld process?
[c] when will mergemaster stop working?

context: amd64 stable/13

thanks,
-- 
J.
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