Earlier today, Latino Review posted a story claiming that Spider-Man will definitely be in the May 4, 2018 "Avengers: Infinity Wars Part 1." "I don't have the exact details nor a paper trail, but I'm told we'll see an MCU Spider-Man in 'Infinity Wars Part 1,'" the Review piece states. "As that was the next logical place to insert him after they missed the window to logically include him in 'Civil War.'"
Well, it didn't take too long for Sony to refute that statement and/or piece entirely. According to Comic Book Resources, that was posted about an hour later had a statement from a Sony Pictures rep that rejected the report, calling it an "old rumor" with "no validity whatsoever."
Spider-Man is a central part of both the "Civil War" and "Infinity Wars" storylines in the comics, and it is only natural for Marvel Studios to want one of its most recognizable heroes in those films. There have been rumors and speculation going back to October that Marvel and Sony were trying to work out a deal so that could happen. It was also reported in December, during the infamous Sony email hacks, that high-level executives from both companies were definitely discussing options for the wall-crawler to return home to Marvel. But there has been nothing definitive to report since then, and there still isn't...regardless of what the Latino Review says.
My take on is this that Marvel will move heaven and earth to get Spidey in these films. Sony knows this and is going to wring every dollar and/or favor out Marvel that they can, so it will take a good bit of back and forth, but it will happen. Just not now.