I wrote up some thoughts on the proposal to replace the current Stage 3 class proposals with a clean slate design: https://gist.github.com/wycats/b1c96c67074396a239abd60f55087adc …
Should be a major topic of this week's TC39 meeting. Very interested in feedback.
Lots of links if you need context 
But this is not like a var or let. The proposal uses var to remind you of "instance VARiable"
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Got that but still would perceive the let block-scope-ness as being a better hint on the variable to be private instance var.
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