The question is always the same because the pattern is always the same. Between E3 and launch, other than car reveals (and not counting presence at Goodwood, Comic-Con, etc):
2013 FM5
July 3 - How Turn 10 Uses Lion Roars and Human Screams for audio
July 16 - Forza Rewards beta program
July 30 - Xbox Smart Match system
August 8 - Xbox One unboxing video
August 9 - Behind the Scenes at T10 with Dan Greenawalt
August 15 - Limited Edition, VIP, Day One cars announcement
August 19 - Gamescom: new demo, Spa (and Laguna Seca) announced, Career mode details, Dan Greenawalt talking physics/Calspan
September 4 - Bathurst announced
September 18 - Forza FilmSpeed
“We’ve heard the feedback. You want more Forza 5 information. And, starting next week, you’re going to be getting more. A lot more, in fact. Beginning on Wednesday, Sept. 25, we’ll be unveiling “The Forza Motorsport 5 Showroom” here on the site, where we’ll be announcing the cars that will be playable in Forza Motorsport 5. Each Wednesday we’ll reveal a new batch of awesome cars until we complete the full car list in November.”
September 26 - Alps and Silverstone reveal, Xbox One impulse triggers
October 6 - Drivatar difficulty settings
October 10 - Assists overview
October 18 - Modern Hypercars overview
October 24 - Direct video feeds begin weekly, Drivatars and the cloud
October 28 - Car Pass announced
November 4 - Day One Car Pack announced
November 5 - Launch trailer
November 8 - press pre-release coverage
November 22 - LAUNCH and website redesign
2014 FH2
July - no new info
August 12 - Gamescom gameplay videos, menus and map, Forza Fuel announced
August 27 - Achievement list, Demo announcement
August 28 - Music list
September 5 - ForzaFuel begins
September 8 - FH2 on 360 details
September 11 - Launch trailer, Loyalty rewards
September 16 - Demo release, Ultimate, VIP, and Car Pass details
September 19 - tv live action trailer
September 22 - press streaming previews
September 30 - LAUNCH
2015 FM6
June 23 - FM6 Limited Edition console unboxing
July 22 - Lime Rock announced
July 31 - Forza Rewards tiers updated
August 4 - Gamescom: COTA/Monza/Sonoma/Hockenheimring revealed, Racing in the Rain video, Forza Fuel announced
August 12 - Achievements list, install size
August 18 - Mods and Prize Spins, Showcase overview
August 23 - partnership with V8 Supercars announced
August 25 - Dom’s Charger promo
August 27 - Gone Gold announcement with poster
September 1 - Demo, press previews, Forza Fuel
September 2 - Launch trailer
September 4 - tv trailer
September 8 - press reviews
September 10 - Early Access
September 15 - LAUNCH
2016 FH3
July - no new info
August 17 - Gamescom: VW out, Perks list
August 30 - Achievements List
September 2 - Warthog promo
September 6 - Wheel support
September 7 - the best interview ever
September 9 - Music List, Groove Music
September 12 - Demo, press previews
September 13 - Ken Block’s car coming to FH3
September 19 - FH3 debut livestream
September 20 - Launch trailer
September 23 - Early Access
September 24 - Petersen Museum launch event stream
September 27 - LAUNCH
2017 FM7
August 22 - Gamescom
Achievements - September 5?
Launch trailer - September 12?
Demo - September 18?
press reviews - September 27?
September 29 - Early Access
October 3 - LAUNCH