You can grab a nightly build of 1.0 if you want to install on top of EAP 6.1 Alpha.
Now that we've moved to EAP as the base platform, the expectation is that you download and install EAP first, then use our installer to install SY on top of EAP. The d/l is called switchyard-installer.zip on that link to Jenkins. We have another option for just unzipping on top of an EAP install instead of using our installer, but I just noticed that we are not publishing that artifact through Jenkins. I'll correct that ASAP.
EAP 6.1 Beta will not work at the moment for our nightly SY builds, but the upcoming SOA-P 6 Alpha will be based on EAP 6.1 Beta. I will look to get the community build profiled as part of the 1.0 release to allow multiple install targets.