[MERGE] Update TBZR implementation plan

[Mark Hammond]

> John Arbash Meinel has voted comment.
> Status is now: Semi-approved
> Comment:
> I'd like to see this, merged, any chance to get the tweaks done?

I was just about to send an email about this.  I'm a little unclear about
the workflow used here - I'd assumed that Ian's modified patch would be
automatically picked up and merged.  Do I need to resubmit it?

Cheers,

Mark