In his latest blog post, IceFrog has provided a teaser as to what to expect from the new map. He reveals that in the new version, there will be new items, new heroes and of course the all important balance changes. IceFrog then continues to provide a little insight as to what has changed.
Firstly, captain's mode drafting system has been change. Instead of the usual four bans, then five picks, it will be split into two ban/pick phase. Three heroes will be banned first followed by a three heroes picks in the first phase. In phase two, there will be two bans then two picks. This will no doubt a great news to DotA fans all around as this will allow teams to possible "hide" their strategy from the opposing team and allow more new strategies to be developed.

Head on over to IceFrog's Blog to see his full post.

Links
IceFrog's Blog - IceFrog reveals more on 6.68