Wait, is there actually a chance for Sun and Moon info?
Timeline of BW info rollout:
29/01/2010 -- Announcement of a new game in development for Nintendo DS
07/02/2010 -- Silhouette of new movie Pokémon shown on Pokémon Sunday
10/02/2010 -- March issue of CoroCoro leaks and reveals Zorua and Zoroark
21/02/2010 -- Zorua and Zoroark formally revealed on Pokémon Sunday
02/04/2010 -- Pokémon Sunday preview promises information on the April 11th episode
09/04/2010 -- Name of the games ('Black' and 'White') and planned Q3 release announced via the website
10/04/2010 -- May issue of CoroCoro leaks and reveals the first information and some screenshots
18/04/2010 -- Pokémon Sunday shows a bit of video footage of the games
09/05/2010 -- Silhouettes of the starters shown on Pokémon Sunday
12/05/2010 -- CoroCoro leaks with info blowout -- region, starters, screenshots
16/05/2010 -- Battle footage shown on Pokémon Sunday
28/05/2010 -- Reshiram and Zekrom revealed, formal worldwide announcement of BW
After that, monthly revelations were as you might imagine. With SM, we're currently like that:
10/02/2016 -- CoroCoro leaks and reveals new movie Pokémon
14/02/2016 -- Magearna formally revealed worldwide
24/02/2016 -- Pokémon Direct announced
27/02/2016 -- Sun & Moon announced to be in development
Like with BW, announcement of the games and the first Pokémon (relevant to the upcoming movie) happened by the end of February, with not much else (except the titles, this time). In BW's case, real information started rolling out in April, with the games being planned to release in September. We're now upon a "late 2016" release date, which most likely means November. With that in mind, the first information could arrive anywhere between April and June. My guess is that we'll have something before E3, but probably not long before.
There's always a chance we see more new Pokémon before game info and screenshots though.