The general outline of President Obama's amnesty plan is fairly well-known, but some of the details will have to await the president's address tonight.

Here's what has leaked out so far:

What is Obama expected to do?

Obama will announce that he is providing relief to various groups of undocumented immigrants through executive action. The exact details are unknown, but he's expected to offer temporary protected status to the parents and spouses of U.S. citizens or legal permanent residents. They must have no criminal record and have lived in the U.S. for a certain number of years (probably five). It's estimated that there are about 3.71 million people in this group, according to the Washington Post.

About a million additional people would be affected by other changes, including an expansion of the 2012 program that allowed "Dreamers," or undocumented immigrants who came to the U.S. as children, to avoid deportation. Obama will probably increase the maximum current age from 30, and the maximum arrival age from 16, but the precise age limits are unknown.

Obama is also likely to announce some other shifts in immigration policy, including increasing visas for high-tech workers, reforming federal immigrant detention procedures, and measures to improve border security.

What isn't included?

The plan is not expected to include protections for the parents of Dreamers, or farm workers. None of the undocumented immigrants allowed to stay in the country will have a path to citizenship or be eligible for federal benefits, such as subsidies for Obamacare.

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What has the White House said so far?

In a Facebook video posted on Wednesday afternoon, Obama announced that he'd be addressing the nation, and simultaneously enraged those passionate about Oval Office decorum by sitting on his desk sans jacket. "What I'm going to be laying out is the things that I can do with my lawful authority as president to make the system work better, even as I continue to work with Congress and encourage them to get a bipartisan, comprehensive bill that can solve the entire problem," Obama said.

I've read reports that claim that Obama's orders will, in fact, affect 450,000 farm workers as well.  Early reports had the president granting amnesty to the parents of DREAMers.  Whether that idea was scrubbed or not is unknown.

The only sure thing about the plan is that it is far beyond anything envisioned by any previous president, no matter what spin liberals want to put on the plan.  Anyone who claims that Obama is only doing what Reagan and Bush did also thinks that a firecracker is exactly the same as a nuclear bomb.  Obama's plan will affect 30 to 40 times the number of illegals affected by the orders issued by Reagan or Bush.  That should settle the issue for most rational people right there.