The release candidates for the first 1.70.0 beta release are now available at: https://dl.bintray.com/boostorg/beta/1.70.0.beta.1.rc1/source/ The release notes are not yet available. The SHA256 checksums are as follows: a7c570d6307d05dc8d45a3b4c69a0afdcba2b22eac0c4da4d496559f53db7b89 ./boost_1_70_0_b1_rc1.7z 4b91b9a203cf12f6001cf39de83c7cc005fbc5390e2b4b2fc29ce7b19c0537a7 ./boost_1_70_0_b1_rc1.tar.bz2 460dd6499bba9df04c6bfa219b26097bad803b8758304ba45f2fc291aa42c96e ./boost_1_70_0_b1_rc1.tar.gz f209c9a086ed2c7882a0bc8755792f436eb141eaeb8c823ed57295ca9ce25b93 ./boost_1_70_0_b1_rc1.zip As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. -- The Boost Release Managers