The above "technologytree" gave the impression that it's already implemented, by the time this will be implemented(IF it's implemented at all because afaik its almost a year since we heard about "instant transactions") the competition will also have something better , my point is that this very moment we have 1 minute for NXT and 10 sec for bitshares and both are trying to improve those times.
Just for you information, BitShares toolkit supports 2 seconds transactions which was proved by testnet, but for BitSharesX was defined as 10 sec because it's suitable enough.