Apparently, here's what we can expect this year (from the JoeCon HASBRO panel, as reported over on HissTank so far):

New App Game! – G.I.Joe Strike by Backflip Studios!
More/New G.I.Joe BlocksWorld!
G.I.JOE 3 currently in the Works!
G.I.JOE 3 will also introduce the market to the next big G.I.Joe line. No new info to announce at this time.
G.I.Joe Toys will be a Toys’R’Us Exclusive once again in 2015.
There will be FIVE 2 Packs!
There will be THREE 3 packs!
DESERT DUEL!
Desert Duel Cobra Basilisk Snow Cat Repaintwith Elite Horseman Driver
Desert Duel FOE Striker with Chuckles in Desert Deco! – IDW Version!! — Comes with Desert Tent and mini gun from 30th Vamp
Silent Strike
NEW Rail Gun HISS TANK! with Repainted Driver and Gunner from POC – Basically an old HISS with a new gun, but still, NEW!
Black Skystriker with Repainted ACE!
Sight Line, a new Sniper!
POC VAMP Driver repaint with Sniper Gear
WOW, how amazing is this – the character’s name & birthplace is a tribute to Gary Goggles Head, aka Gyre-Viper. *APPLAUSE*
Swamp Steam 2 Pack – RED VERSION OF CROC MASTER!!!!!one!!uno!!11! WITH GREEN BLOWTORCH! *BOOM*
Iron Grenadiers and Steel Brigade Troop Builder Sets – 2 Packs!
Classic Clash 2 Pack – Concept Case Storm Shadow in his v2 G.I.Joe Uniform & Spirit Iron Knife!
Red & Black Cobra Commander – His faceplate is chrome
Shipwreck & Polly
Marine Devastation 2 Pack – Cobra Shadow Guard vs. Gung Ho! CONCEPT CASE!
Gung Ho has classic accessories and a mini gun that’s color accurate to ARAH
CHASE FOR THE MASS DEVICE! – Re-release of the 5 pack figures; Alpine, Rock Viper, Shock Trooper, Cobra Commander, Trooper and Screaming Duke with Flag
Torpedo, Hit & Run and Zartan – Vanishing Act 3 Pack
Bazooka, Dusty and Firefly – Sneak Attack 3 Pack!
SDCC EXCLUSIVE – Cobra Scythe Crimson Strike Skystriker – Crimson Guard Deco; Comes with AVAC and Alley Viper.
SDCC EXCLUSIVE – Crimson Strike HISS Tank
SDCC EXCLUSIVE – G.I.Joe Chimera, the Rail gun HISS Tank mentioned earlier in this post.
Another 2 Pack via Entertainment Earth; Desert Duel set is TRU – No Brick & Mortar.
SDCC EXCLUSIVE KRE-O SET! – No Info Allowed at this time.
KRE-O G.I.JOE IS NOT DEAD!