U.S. immigration law is a maze of preferences, exceptions, bureaucratic interpretations of regulations, but one principle (usually) underlies it: families should be able to live together, should be reunited if necessary.
For most Republican officeholders, conservatives and the particularly the Roman Catholic Church (otherwise a reforming institution), gay people's relationships can't form families. Consequently, family reunification policies don't apply to us.
There are an estimated 32000 binational LGBT couples (one born in the U.S., one a noncitizen) in the country today. Colorlines reports that nothing in the current proposal helps these couples.
Yet. One more hurdle to jump ...