The "changes" are pretty unclear, but here is my understanding of current procedures:

• Be prepared to remove your shoes. Not all stations are obsessed with shoes, but at many (including LGA on at least one of my recent trips through--it's hard to keep 'em all straight) they will subject you to secondary if you don't remove them--regardless of whether or not your shoes fit the mysterious secret profile.
• Laptops are still coming out of bags and being placed in their own bins.
• Coats, jackets, and sometimes even sweaters are getting x-rayed (no wearing them through the metal detector).
• If you do get secondary, expect much more poking and feeling than in the past.

Remember, if your goal is speed through the checkpoint, just don't argue with 'em. It's not worth it. And I always stick my wallet and cellphone in my daypack before I go through, to speed things and to minimize chances of theft (or me forgetting them).