1- Captains Mode: There is a new ban and pick system for CM in 6.68. Instead of 4 bans and then 5 picks, now it is 3 bans and then 3 picks followed by 2 bans and 2 picks. Information about the exact drafting order will be detailed in the changelog.
Wow, this should make the draft more interesting. Since we can guess the enemies strategy from the first 3 picks, now we can counter it on the second round of bans.
2- A new basic item, Orb of Venom:
I don't know what it is.. But i guess it is something that gives a slow or maybe poison effect.
3- Tiny with a new ability he gains from Aghaninm's Scepter:Wow, Tiny seems scarier now.. I wonder if the new ability has something to do with that club he carries.
4- Kinetic Field, an ability on one of the new heroes:
Seems that 6.68 is almost done :) Let's hope it'll be released as soon as possible.