This could actually be quite useful if I go teach TEFL English in Romania:)
It could be referring to a staff member or whoever telling another person about new students in a class which happens alot (the teacher is new and not aware of the changes). This happened to me in Taiwan where I started a class and was told that some students were new. The change of students was new, and it was my first lesson with that same class.
It is not necessarily a rule, but it is a very strong tendency for most adjectives, at least. If you put adjectives before a noun it can sound poetic (I would avoid doing that unless you know what you're doing, you can sound ridiculous otherwise). Sometimes the adjective changes meaning depending on whether it is placed at the beginning or the end of the noun. Examples:
Săracul copil nu are prieteni! - The poor kid doesn't have any friends! (Poor him!)
Femeia săracă a trebuit să împrumute bani. - The poor woman had to lend money (she is poor in the literal sense of the word: she does not have money).
mare (big, but also great):
Clădirea (cea)* mare se află pe dreapta. - The big building is on the the right.
Marele nostru lider ține un discurs! - Our great leader is giving a speech! (he is great and mighty and such)
*The sentence sounds more natural with "cea", yet it is not mandatory. Ignore it for now.
Because this is such a weird sentence in English (but not in a cool, or humorous way) it makes the lesson a bit difficult for the learner. I would reconsider including this one in the series. That said, I flipping LOVE this course and everyone who contributed to it! You guys are awesome!