Though Coulsons fate is currently unknown
Despite Agents of SHIELD having a wrap up story line for a good number of characters at the end of season 5, it was renewed at seemingly the last minute at the end of the 2017-2018 run. Then, during the upfronts, we found that season 6 had been pushed all the way to summer 2019. This would make sense, given that half of the cast would most likely be absent during the two latest Avengers films. Bringing the show back after the outcome of Avengers 4 would give our heroes the chance to wrap up the fallout from the films, and probably their own story lines for good. Many expected an abbreviated run of 13 episodes to finish out the series as a whole.
ABC and Marvel have scattered those theories to the wind with the announcement that the Agents will be back for Season 7, again for 13 episodes.
Channing Dungey, who has just left her role as ABC Entertainment president, said in August:
"We'll see [if it's the end]. I feel like last season was our strongest creative season ever and the fan base remains very loyal - and we do very well in delayed viewing," said Dungey. "It's my hope that by moving it to summer, where our live-same-day ratings are less important and it might be able to continue for longer."
Seems she was right to be optimistic.
Listed so far are Ming-Na Wen as Agent Melinda May, Chloe Bennet as Daisy Johnson, Iain De Caestecker as Agent Leo Fitz, Elizabeth Henstridge as Agent Jemma Simmons, Henry Simmons as Agent Alphonso 'Mack' MacKenzie and Natalia Cordova-Buckley as Elena 'Yo-Yo' Rodriguez.
Obviously this leaves Coulson, played by Clark Gregg, as an unknown entity. Despite his "retirement" at the end of Season 5, it is highly expected that he is returning for the full run of Season 6, and is even directing the first episode, titled "Missing Pieces". Hopefully the missing piece of the character list is just a decoy, and Phil (when did he become "Phil"?) will be with us for the entire run. Coulson can next be seen back in the MCU, running around with Nick Fury and Captain Marvel in the 90s.
Dungey also hinted at the time that ABC were in discussions with Marvel about a new property, despite the demise of Agent Carter and Inhumans. Since shes no longer president, and with no absolute confirmation, any future plans may no longer happen. Keep an eye on the TV Calendar for any updates.