It's not a Limit episode(for some reason they posted that), it's Limit Cut Episode(リミットカットエピソード).
To explain the meaning of this is a bit difficult to explain because it's just used for Japanese people who played KH2FM(of course, it's also the name of an ability in 358/2, etc but not this time) and i think it's better to explain this in Japanese.
Limit cut it's a word that it's only used until now to describe the "Data Organization 13" in KH2FM.
Well Limit Cut I think it's the bad translation(?) of 制限斬り
制限= Limit
切り = cut
Meaning "Something that cuts the limit". I think it's used to say something like something that has strength beyond the limits, or something like that.
For example they usually use Limit cut's Xemnas, or Roxas, or Marluxia, etc.
And the Limit cut episode will be something like the Cavern of Remembrance and the bosses something like the data Organization, probably.
Well of course, i'm not 100% sure if LCE will be that.