From its nadir in ~1994 with the federal Assault Weapons Ban, you've seen that ban expired, numerous states liberalize their rights to bear arms (either concealed, or since 2009 or so openly), and the Supreme Court rule in Heller that the 2nd amendment is a protection of an individual right. 4 or so states have bucked that trend, but the overall trend in the past 20 years is, if not fast, directionally clear.
I say it was more like a 30 year process, starting with the Firearms Owners Protection Act of 1986, which prevented the BATFE from extinguishing US gun culture using the Gun Control Act of 1968, and Florida passing a shall issue law in 1987 which got the carry ball rolling after the predicted "Blood in the Streets!" and "Dodge City!" didn't happen. So if you accept my starting point, neither very fast nor initially directionally clear, nor directionally clear in the last couple or so years.
ADDED: and essentially none of it outside Illinois was forced by the federal courts to date, and that anti-trend looks to continue. Heller and McDonald were nice, but have resulted in very few changes on the ground, nor in the political debate. Although the changes in Illinois are dramatic, extremely so for Chicago and a few of its suburbs, which went from a complete ban on civilian ownership of handguns to shall issue concealed carry (and without automatic prosecution of self-defense cases) in 3 years (!).
As for details, there are currently 7-10 viciously anti-gun states as I count them: unquestioned are California, Hawaii, Maryland, Massachusetts, New Jersey, New York, and Rhode Island. Connecticut and Delaware are shall issue concealed carry in practice, but that could change, and Colorado, Connecticut, and Washington state have gotten worse post-Sandy Hook. And of course, the District of Columbia, the subject of Heller, is practicing Massive Resistance, with the Federal court system not really interested in resolution or following the Supremes.
