It has been a few months since we have had a proper build of Windows 10 leak but that changes today as build 10036 has been posted on the web. Per usual, we will not link directly to the build but it can be found in the usual spots if you dig around a bit.
As with most of the previous leaks, this build comes from a partner channel, which is why it is missing some of the features (like Spartan) that you would expect in the next version of Windows 10. These features are intentionally left out of partner builds for various reasons (one being they leak more often than internal builds), so do not fret about missing components.
As with any leaked build, we do not recommend installing it as it is not supported by Microsoft. If you choose to do so, it is at your own risk, and there is no support available from Microsoft.