$5 says the last LI is Blackwall with no gating and is available to male and female Inquisitors. I expect payment upfront, cash only, no exceptions! (I'm kidding, btw.) I'm actually expecting to lose as I've yet to be right when it comes to LI guessing games. Eh, there's a first time for everything, right? 
Yeah, my 'official' guesses after the cast reveal were very off the mark. I made them so long ago, Blackwall and Josephine were still called Scribbles and Feathers.
Here's how bad my guesses were(Although, to be fair, I called the fact that there would be 8 LIs, and two of them would be race-restricted, very early on). Copying and pasting for authenticity.
8 romanceable characters(6 of them party members)
2 Exclusively heterosexual(Cullen and Cass)
2 Exclusively homosexual(Scribbles and Feathers)
2 Race-specific(Varric and Iron Bull)
2 Any-race, Any-gender(Sera and Dorian)
So......I was right on the straight people! Although, I think I was mostly in hopeful denial on Dorian and Sera. I REALLY wanted them to available for hetero romance. Didn't get my wish. I also thought that Solas and Vivienne would not be romances and Varric would. Totally wrong on Solas and Varric, jury is out on Viv and Blackwall.
Man, I think for the next game, I'm going to steer clear of guessing LIs other than the straight ones. It seems to be what I'm best at.