During E3 Square Enix trademarked Echoes of Time. Since the DS port of Chrono Trigger has been out of the bag for weeks this trademark could be a subtitle to the remake we already know about. Chrono Trigger: Echoes of Time sounds much better than Chrono Trigger DS. On the other hand, Square Enix never said Chrono Trigger was a temporary title. Publishers typically note these details to prepare everyone for a name change. When Star Ocean 4 was announced in Japan it was clearly labeled as a temporary title.
Square Enix may have plans on revitalizing the Chrono brand with a strategy similar to Valkyrie Profile. A port of the PsOne game came out on the PSP first and was quickly followed up with a proper sequel in the same year. I’m not saying Square Enix is going to release a brand new Chrono game this year, but it's a no brainer that they have plans on expanding the franchise. This trademark might be a pre-emptive clue or not. You decide.
Images courtesy of Square Enix.