According to the infamous, superhero movie 'scooper' El Mayimbe, he's learned the identity of Star-Lord's father in James Gunn's Guardians of the Galaxy, Vol. 2. We learned from the first film that Star-Lord's father was described as an angel, composed of light. He was also described as an ass-hole by Yandu. Furthermore, according to the Nova Corps. Star-Lord's father comes from a race not seen in a very long, long time. Given these clues, it makes the report from Heroic Hollywood a bit of a head-scratcher as the name they supply doesn't entirely line up with all the clues we've previously been given.
According to HH, Star-Lord's father is Spoiler [Captain Marvel or Mar-Vell to be precise]. On paper, it seems plausible but when you examine the clues given in the first film, it doesn't line up with Marvel Comics lore unless Kevin Feige and co. are prepared to do some radical, re-imagining of this particular character's backstory. With that in mind, takes this news with the usual dosage of salt in hand but be prepared to give praise to the divisive El Mayimbe if this one proves true.
[UPDATE] James Gunn wasted little time debunking that rumor.