We do currently have a public beta for PostGIS (https://devcenter.heroku.com/articles/is-postgis-available) though it is only available on certain plans and is not yet GA like the other extensions.
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Once PostGIS is out of beta, will it be available on dev/Kappa/Crane? (I tweeted @heroku about this, but never got a response)
Are there any plans for PostGIS 2.0 support? Would make me very happy!