​MIAMI — Thursday will be a big day for the Miami Heat. The question is how big?The certainties are the formal introductions of Giannis Antetokounmpo and Bobby Portis at Kaseya Center media sessions. The uncertainty is whether it will also be decision day for once-and-perhaps-again former Heat forward LeBron James.AdvertisementAdvertisementAdvertisementWhile James has been deliberate in his approach to NBA free agency, he scheduled for appearances on Thursday and Friday in New York at Fanatics Fest, including a live taping of his Mind the Game podcast on Thursday, a taping that will include Indiana Pacers guard Tyrese Haliburton and “additional surprise guests.”What makes the timing of James’ podcast so intriguing is that it will not be released until July 21 on YouTube, Prime Video and other platforms, which would make an announcement in the interim somewhat awkward.That taping is scheduled for 1:15 p.m. Thursday, which curiously places it between the Heat’s introduction of Portis at 12:30 p.m. and Antetokounmpo at 3 p.m.The Heat will stream Portis’ introduction on their YouTube channel, with Antetokoumpo’s introduction to be streamed on the Heat’s YouTube channel and also televised on NBA TV and in South Florida on WPLG Local 10.AdvertisementAdvertisementAdvertisementAntetokounmpo and Portis were acquired from the Milwaukee Bucks in the trade that sent back Tyler Herro, Kel’el, Kel’el Ware, Jaime Jaquez Jr., Kasparas Jakucionis and significant draft capital.The two introductions Thursday at Kaseya Center are media-only events, unlike the arena-front celebration when Shaquille O’Neal joined the Heat in 2004 or the in-arena celebration when James signed with the Heat in 2010.As for James, he has been linked to several potential suitors since his announcement last month that he would be moving on from the Los Angeles Lakers.The Heat have a portion of their mid-level exception to offer, but agent Rich Paul in numerous media appearances stressed that his client’s “happiness” will be the overriding factor in the decision.AdvertisementAdvertisementAdvertisementOther teams linked to the 41-year-old eventual Hall of Famer are his hometown Cleveland Cavaliers, Golden State Warriors, Philadelphia 76ers, Denver Nuggets and Minnesota Timberwolves.James was with the Heat from 2010 to 2014, leading the Heat to NBA Finals in each of those four seasons, with the Heat winning NBA championships in 2012 and ’13.While the parting in 2014 free agency was acrimonious, there since has been resolution of that bitterness, with James praising the Heat in the interim for contributing to his maturation.Should James bypass the Heat, the Heat then are expected to move quickly to continue an offseason overhaul that also has seen them lose free-agent guard Norman Powell to the Chicago Bulls and add free-agent guard Tim Hardaway Jr. from the Denver Nuggets.AdvertisementAdvertisementAdvertisementAmong those the Heat have been linked to this offseason