My stock unrooted wifi galaxy tab 10.1 just received an update OTA that seems to have done nothing except LOCK my unlocked bootloader. It was only 11.2mb and during the update process my tab went into download mode, then to a command line looking interface with commands related to encrypting bootloader. I no longer have the unlocked symbol upon boot up. Look out for update version UEKG4!
EDIT: Google videos app has been loaded as well, but not in the market, just the app.