To be honest, I'll be (pleasantly) surprised if we hear of any titles beyond Cap 3, Dr. Strange, and Thor 3 (on the film side). There's no way they're announcing titles all the way out to 2019, and even through 2017 is unlikely, IMO.
When you look at the past few SDCC's, in 2012, the big news was GotG (in 2014). In 2013, the big news was Ultron (in 2015). They seem to go out about 2 years, so this year will go out to 2016, which is Dr. Strange. Tacking Thor 3 in there as well is a no-brainer, since its also supposedly in production. But anything beyond that, I expect, will probably get a coy "you'll just have to wait for next year to find out" from Feige.
But like I said, I hope I'm wrong!