From today, LoL players can join the open beta for the MOBA's client update. It's just a quick 1.5GB download and then you're away with the new-look client.
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When you launch LoL, you should see a download prompt, and you just need to give that a click if you want to opt into the beta. Anyone in the alpha will automatically transfer over. You're not forced to upgrade, if you haven't opted in for the alpha, however - you can just switch over when it suits.
As ever, there are some caveats with it being a beta. Expect some bumps, basically. There are also some features missing currently, like a spectator mode, though these are planned to be added in patches.
Some of the more flashy animations are also missing, but it will all be added in time, along with optimisation patches. Once all the new features are live and the build is stable, it will replace the legacy client.
Replays are also launching on a region-by-region basis with the open beta, and these can only be accessed in the new client. Check out the FAQ for more info.