They changed nothing to it, but Gen 5 EXP scaling means that the curve will gently go upwards as the developers intended. Meaning, if they want you to be level 30 by a certain area, pushing level 32 by a certain point will be nigh impossible as the low exp yield rates will be split between 6 Pokemon, resulting in a VERY slow crawl. But its also the absolute best to gamble sending out a low level mon, and gain the ability to use it almost instantly in the late/post game. Basically, they implemented it far too soon, and the only way its going to be a positive is if they keep the gen 5 EXP formula.
