In the fourth inning of today's Pirates-Cubs game, even the WGN announcers were incredulous that Starlin Castro was ruled safe on this play at the plate. It turned out to be the first questionable use of a new MLB rule meant to crack down on collisions at the plate.
Here is the newly approved (and "experimental" ) Rule 7.13. You need only pay attention to the parts I've bolded.
The MLB rules committee has voted to make collisions at home plate illegal. This isn't an official rule change yet, as the decision still has to be approved by the players, but it sure looks like the home plate collision's place in baseball is no more.