My guess is their only trying to make a quota or something "having most players on by the end of their first year." assuming that it will be one year since vindictus has been released.
as for what this is going to do to our gameplay..well there has been rumor the 4th character will be released on april 1st...april's fool day so yea (rumor is the big "APRIL 1 ????" banner on the main page with a silhouette of a character presumably male, bulky)
if they do release the new character, well game play will probably stay the same seeing how many people will be playing catch up with their new character.
if they do not release a new character...i assume it'll stay the same. according to the actions of a traditional mmo'er, this will probably make afew more stay longer with less people quitting i guess. the thing is people will quit whatever nexon does, this will just keep those few people on a little bit longer...enough to meet the 1 year quota or something lol
just my 2 pennys