Here are the direct download links to Java 8 Update 51 offline installers:
What’s new in Java 8 Update 51
The new Java introduces the following new and enhanced features:
Native Sandbox has been introduced which will let applications run in restricted mode. Native Sandbox is available in Windows only and is disabled by default. If you want to enable it, you can go to Java Control Panel->Advanced settings->Enable the operating system’s restricted environment (native sandbox).
Some bugfixes have been introduced in the latest release as well which includes new root certificates for Comodo, GlobalSign etc and removed some old root certificates making Java more secure.