Since last Wednesday's update, we announced the App Center, published Action Links for Timeline Apps, a Developer Spotlight on Kobo, and a How-to: Improve the Experience for Returning Users.
As announced on the Roadmap and Developer Blog, on June 6, 2012, the following changes will be in effect:
Removal of FBML
FBML apps will no longer work on Platform. All FBML endpoints will be removed. If your app is still utilizing FBML, please migrate before June 6 to avoid any issues.
XMPP Connections must be done over TLS
Apps connecting to Facebook's XMPP service will be required to use STARTTLS for all connections. We will start rejecting unencrypted connections.