There is no new law like that. It just happens that they have been clearing the queue very fast in recent months, and now the backlog for the Family 2A category (spouses and under-21 unmarried children of permanent residents) has been reduced to 17 months as of the August bulletin (29 months if the spouse or child is from Mexico or Dom. Republic). However, historically it has been at 4-5 years, so you should not expect the 17 month time frame to remain like that; you should be prepared for it to go back to the usual 4-5 year wait.I recently heard that there is a new law, through which you can file for your spouse's visa if you have green card and it will take 18 months.