Redstone 2 is the second wave of Windows 10 Redstone. A number of Insider preview builds have been released, the final release date is 2017-04-11.
This will be Replaces to Windows 10 Redstone 1, and it was replaced by Redstone 3.
Insider Preview
14877.1008.rs_edge_app_eal.160711-1000
14894.1000.rs_prerelease.160727-2341
14896.1000.rs_prerelease.160729-1700
14936.1000.rs_prerelease.160923-1700
14946.1000.rs_prerelease.161007-1700
14951.1000.rs_prerelease.161014-1700
14955.1000.rs_prerelease.161020-1700
14959.1000.rs_prerelease.161026-1700
14965.1001.rs_prerelease.161104-1700
14971.1000.rs_prerelease.161111-1700
15031.0.rs2_release.170204-1546
15058.rs2_release.170310-1436
RTM
15063.1001.rs2_release_xbox_1703.170319-1800
15063.1003.rs2_release_xbox_1703.170321-1800
15063.1005.rs2_release_xbox_1703.170323-1228
15063.2001.rs2_release_xbox_1703.170321-1900