I believe the best move for the Xtools rewrite would be to stage a beta. This task is to plan and execute that.
We should start by placing a banner on the old Xtools:
(WARNING) Xtools is beta-testing a new version. Please test it __here__
And on the new Xtools:
(WARNING) This is a beta version of xtools. If you find any bugs, please report them to __Phabricator__
Now for the discussion part: How long should we run the two xtools in parallel before we replace the old xtools? When should be our start date (July 1?) ?