Sony has recently registered a few new titles with the US Patent and Trademark Office, presumably for upcoming PSN games and one possible engine that will work cross platform with other Sony products such as phones, DVD players, and video cameras.
The titles in question are Ember, SkyBlue, Carriage Return, Race Day and Strings Attached. Also on this list is The Broadcast Engine. While none of these titles have been announced as games, it is likely that these are the names of upcoming PlayStation Network titles. They certainly sound like the sort of names you would see attached to the quirky games available to download.
The Broadcast Engine was registered through the Japanese office. There has been no information on this as of yet, but it may have something to do with the PlayStation Network being accessible through many outlets.
As always, stay tuned for more details.