I have 2 Tours (one work, one personal), both with FB loaded - one with v188.8.131.52 and one with the new 184.108.40.206. Attached is a screen shot of the versions side by side, with the old on the left.
Looks like minor formatting changes where it notes how many comments there are on a status/link/picture/whatever. And the people who 'like' something now shows under the comment/like links instead of to the left of them.
I've noticed this version is loading faster, too. Anyone else notice that?