MIT did indeed switch from Scheme to Python for their introductory courses (though I've heard they still use Scheme in some more advanced courses).[1][2]
However, I recall that a little later some MIT graduate students started teaching their own version of the classic SICP-based course. I can't seem to find a link to it now, unfortunately. I wonder how that turned out, and if they're still teaching it now.
Brian Harvey was also teaching his own version of the old CS61A last I heard, but he may be retiring after this year. (I've been hearing about him retiring pretty much since I started at Berkeley 5 years ago, for what it's worth).
However, I recall that a little later some MIT graduate students started teaching their own version of the classic SICP-based course. I can't seem to find a link to it now, unfortunately. I wonder how that turned out, and if they're still teaching it now.
[1] - https://news.ycombinator.com/item?id=602307
[2] - https://news.ycombinator.com/item?id=530605