And @Debian builds of R 3.4.2 have been made and shipped.
Peter Dalgaard @pdalgd
28 Sep 2017
#rstats 3.4.2 "Short Summer" is out (source version)

Sep 28, 2017 · 10:44 AM UTC

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Replying to @eddelbuettel @debian
Upgraded Xenial via rrutter PPA but having major issues :( apt has uninstalled r-recommended + revdeps because of no suitable "r-api-3"
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Please see r-sig-debian. Twitter is the wrong place for this, even at 280 characters (if I had them...).