I posted this in the PL Roster thread, but I'll make a new thread anyways. Basically it's just bits of information on each team as well as the explanation as why KTF's lineup is showing some drastic changes.
WeMade FOX: Casy
Due to his absence from progaming over the months of his battle with OGN, Casy was given time to recover to his old form by starting off with the B team. Once he's back to his old skill then he will be included in the A team and the Proleague roster.
KTF: ChoJJa, GooDFriend, Ever)Z(aQua, Sync
This situation here is much worse. All four players were given a paid leave, and are no longer at the Magic Camp (KTF HQ)... The only difference is that ChoJJa and GF are allowed back depending on the situation.
There's no specific details, but basically there's some inner-team problems between the players. In a recent interview with the KTF Coach, Ra, Reach and Garimto about the new season of proleague, they all mention that their weakest attribute is their inability to work as a team. Now, THIS IS ONLY SPECULATION, but I think this is a hint that recently the team has been divided amongst the players. And seeing how ChoJJa, GF, aQua and Sync are all kicked out of the Camp (apparently GF and Chojja are currently paid on-line practice members... lower than B team), these 4 must have been the main problem. Whether the problem is amongst themselves or against others, we don't know.
In the case of ChoJJa and GF, as mentioned earlier they are allowed back once the problems or fixed. FiFo mentions that KTF tried to trade ChoJJa and GF off since they are strong players, but their name values were too high for other teams to take them.
SKT1
It was announced in FiFo a few weeks ago that both Rainbow and Kingdom were "technically B Team". I don't think it was official, but both players were training with the B Team and were following their schedule. The reasons stated were obviously due to the lack of results these two have been showing. The roster shows Kingdom but now Rainbow, which leads me to believe that Rainbow is still struggling with playing up to his skill.
Meanwhile the captain has been changed from Kingdom to Oov. However, the jobs to the team captain has been reduced significantly as to not overwork the captain, and giving him sufficient time to train himself and practice.
CJ Entus
This news was a few weeks back, but it FiFo wrote on August 14th that both XellOs and Much REQUESTED themselves to be demoted to the B Team. It is said that they follows the B team schedule (which is usually much more intense than the A team), trained with them and even did the chores given to the B team like laundry and dishwashing (which is extremely rare since both of them are much older than the others... a real humble thing to do especially in Korean culture).
But only a week later both XellOs and Much were able to pass their offline prelims at the OGN Starchallange, showing great effect. It isn't stated however if both players were brought back to A team or not. I'm assuming they are by now.