A set of requirements such as pay a fine, obtain a postive health screen, pass a criminal background check, and demonstrate basic citizenship knowledge as justifiable reasons for being converted from an illegal alien into a legal immigrant.
Also a route to citizenship for those who want it, even if (maybe "especially if") they have been in this country illegally for years - "cutting ahead" of those who applied for citizenship under the present legal regime.
Increasing border and interior enforcement, while reducing the hurdles for obtaining the status of legal immigrant.
Increasing the number of visas.
In general, legitimizing the presence of what are presently illegal aliens.
As for the details, obviously in a state of flux as Congress is debating the matter. And there are additional details (e.g., tuition arrangements, cooperation of government authorities other than federal immigration enforcement) absent from the short list of bullet points above.
First of all, I don't believe for a second that even one of these illegal aliens would pay it.
But even assuming for a moment that they did, it's the equivalent of a quarter or a fifth of the routine charge for smuggling one of them into United States territory.
This is a slap in the face to Americans, courtesy of the U.S. Senate.