Rumour is, it's a Tiger Force set, so what does any one expect to see?
Personally, I'm thinking:
Almost certain in main set:
Roadblock
Bazooka
Lifeline
Tripwire
Dusty
Recondo
Highly Likely in main set:
Tunnel Rat
Sneak-Peek
Big Brawler
Stalker
Possible in main set:
Mutt
Crosshair
Beach Head
Wreckage
Plausible but unlikely:
Psyche Out (in 2013's Night Force set)
Outback (in 2014 Eco Force set)
Hit&Run (in 2013 NF set)
Dial Tone (in 2011 SMB set)
Blizzard (jungle skier?)
Alpine
Jinx
Hardtop (just... no.)
Likely in an attendee set:
Skystriker
Frostbite
Not happening:
Duke, Flint, Wild Bill (all released at retail)
Vehicle wise, I suspect three possibilities for the 'big ticket' item: TF Eaglehawk, TF Ghost Hawk II or TF Black Dragon. An outer possibility is a TF Conquest X-30. Smaller vehicles: VAMP mkII modern version (possibly less likely since the same mould was used for the 'Rescue Ops 4x4' last year), Wolfhound (also less likely as it was the basis of the Club's HAVOC mkII), RAM cycle or one of the Arishikage bikes (the RAM seems more likely), Ghost/Sky Hawk, Fangboat as a Tiger Shark II (seems less likely since they used the Moccassin/Sting Raider for 2011's SMB Python Moccassin)
for the enemies, I think maybe Shadow Tracker in a new colour scheme, a bunch of Jungle-Vipers in a new colour scheme and maybe Kangor or Urzor.
mad possibility for para drop: Tiger Force Ripcord...