Version 1.2 has a few cosmetic changes: the tool item was removed by popular vote as the Help > Eclipse User Storage menu item was deemed sufficient; a stray separator was removed too.
Version 1.2 removes the login/password-based "session" authentication mechanism. Although this would normally be considered an API-breaking change, the Foundation's servers ceased supporting login/password in 2018. All known SDK consumers changed to use OAuth-based authentication in 2017.
Version 1.2 fixes some of its dependencies to pull in Apache HTTP Components using package imports instead of require-bundles.
Finally, the source code is now licensed under the Eclipse Public License 2.0.