I just saw a news article saying Flame is joining IMT, is this true?

Possibly. While only a few things are "confirmed" right now, the roster looks to be this:

Top- Flame (the guy who the "flame horizon" was named after) JG- Dardoch (confirmed to be on the roster after signing a multi-year deal) Mid- Pobelter (also confirmed, as he signed a 2 year deal) ADC- Cody Sun (another confirmed, quite possibly the greatest signing of the entire offseason as he was not only top-5 of challenger for a while but also had a habit of out-playing the best NALCS players in solo-queue) Support- ??? (Due to the fact that everyone barring flame is NA, this could literally be anyone with interesting options such as Madlife still free agents)

Yea it's been confirmed, only unconfirmed player is the support with the current lineup being Top- Flame JG- Dardoch Mid- Pobelter ADC- Cody Sun Support- No one knows........