Adobe released first beta of their next Flash Player 11 for testing purposes and Stage 3D and 64-bit support features from Flash Player Incubator are included in this beta are new noticeable features. No browser except from Internet explorer had 64-bit release till now, to use this 64-bit flash player plug-in in 64-bit Windows Operating system you need to be using 64-bit Browser like IE.
What’s new in Flash Player 11 Beta
Stage3D APIs — Create highly interactive visuals to improve collaboration on 3-dimensional models.
64-bit support — Support for 64-bit operating systems and browsers on Linux, Mac OS, and Windows.
G.711 audio compression for telephony — Integrate voice/telephony into business apps using G.711 codec.
H.264/AVC SW Encoding — Encode higher quality video locally using H.264 video.
Socket Progress Events — Build advanced file sharing apps like FTP clients that send large amounts of data.
HD surround sound — Deliver full HD videos with 7.1 channel surround sound directly to AIR powered TVs.
You need to uninstall previous flash player installed in your Computer prior to installing Flash Player 11. After uninstalling Flash Player 11 you can install Flash Player 10 in your Computer if you want.
You can download Flash Player 11 Beta 1 from this page.