All active subscribers who can accept the terms of the Non-disclosure Agreement are invited to join the Adobe Muse Private Beta program by visiting http://museprerelease.com
If you prefer not to Beta test, the first opportunity to learn the specifics of what's coming would be to sign up for the announcement here <Adobe Creative Cloud Launch June 18, 2014 | Live event sign-up>.
If you have a site that demonstrates undesirable compression or other undesired behaviors, the most constructive way to engage with the community is to provide the URL for a page along with a description of the specific problem. Thanks.