There are actually two releases here. First is jQuery 3.0, which supports modern browsers and environments from IE9 forward. Second is jQuery Compat 3.0, which includes support for IE8. As an added bonus, both jQuery and jQuery Compat will include support for Yandex.Browser, a freeware browser released in 2012. You can get the files from the jQuery CDN, or link to them directly.
Source: jQuery 3.0 and jQuery Compat 3.0 Alpha Versions Released | Official jQuery Blog