The word we get from Paul Ryan and Mitch McConnell is that the American Health Care Act (actually it's just a bill right now), is the bill. This is the ObamaCare replacement. Take it or leave it.
It doesn't sound like that's necessarily President Trump's position. He spent several days last week in intense discussions with conservative members of both the House and Senate - as well as libertarian Rand Paul, who sometimes pretends to be conservative - trying to reach an agreement that will push a good bill forward to passage. What the conservatives most seem to want is a quicker halt to the expansion of Medicaid, which Trump seems to be open to even if a lot of Republican governors in states that went ahead with the Medicaid expansion are nervous about it.