Perhaps an RC version of the guide 
I think it’d definitely be valuable to get the upgrading from 1.2 article out with the RC, but at the same time it’ll be easiest to wait as long as possible to write it, because things can always change until release. But we’ll have something.
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PS you can read the in progress 1.3 guide here: http://guide.meteor.com/v1.3/
Right now it’s the same as the 1.2 guide but that will change soon!
And I saw some branches with some new info.
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