"Titan" trademark filed, but not by Blizzard.
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We always had a solid idea that "Titan" is just the internal codename for Blizzard's new MMO (like "Project Hydra" was for Diablo 3), and I guess this sets it in stone. Respawn Entertainment describes itself as an "independent video game development studio" that's "currently working on its first title," so there isn't any apparent connection with Blizzard.
Meanwhile, we're still waiting for Blizzard to register a trademark for their new MMO. If they plan on releasing any info about it at this year's Blizzcon, like our recent leak hinted, we should see one pop up this summer. As a guideline, they filed the trademark for Mists of Pandaria at the end of July, with Blizzcon that year being towards the end of October.
And since we're on the subject, I want to clarify one of the most often asked questions on TF's forums: yes, this website will change its name to fit with Project Titan's actual commercial name. As soon as I know it, I'll make the switch. Some "Titan" mentions will probably remain here and there, for nostalgia's sake if nothing else. These past two years, while a bit on the quiet side, have been nothing but awesome so I have no intention to completely erase them while advancing forward.