Today, afetr a week of silence, Samsung has updated the unofficial Tizen SDK 3.0 again . In the Changelog one can find an interesting entry:
Changed packages: - mobile-webapp-ext-eplugin Package: mobile-webapp-ext-eplugin OS: windows-32, ubuntu-32, windows-64, ubuntu-64, macos-64 Version: 1.0.2 Changes: - Support mobile-2.3 platform Uploader: changhyun1.lee <changhyun1.lee@samsung.com> 2014-05-08
The entry refers to a version 2.3 which has not been seen anywhere yet. So it could well be possible that Samsung updates the 2.x branch of Tizen before releasing Tizen 3.0.