There's a similar description here that I meant to post several days ago:

http://badassdigest.com/2014/11/17/what-will-the-first-star-wars-the-force-awakens-trailer-contain/

I think someone in this thread mentioned a week or two back that the teaser would be attached to Into the Woods, although that might've just been pure speculation passed off as rumor. It would certainly make sense, being a Disney movie, kind of like how that very first teaser for Interstellar was attached to The Desolation of Smaug (another Warner Brothers project) almost eleven months ahead of time. It would also make sense because Into the Woods opens Christmas day and it will then be 358 days until Ep7 comes out.

It's a good bet we won't see the next trailer until May. For one thing, it will give ILM enough time to finish a decent amount of effects shots to show off. Also, there's May the Fourth and 5/25 as potential dates to time the trailer around. Actually, it would make sense attaching it to Tomorrowland on Memorial Day weekend since it could potentially draw more people to the theater to see the trailer on the big screen (although the novelty is kind of lost when they'll most likely upload it to youtube in hd quality several days ahead of time). Either way, Age of Ultron certainly doesn't need that extra incentive to buy tickets.