He recently got played on Hot 97
Right after Summer Jam, where Kendrick told Miss Info about the new TDE signee, Hot 97's Peter Rosenberg played an Isaiah Rashad song called "I Shot Ya Down." Rosenberg also announced that Isaiah was signed to a major label. Back in May, Rosenberg tweeted this:
It's no official confirmation, but if Isaiah was the latest signee, this would all make sense.