That mid-week fixture isn't Amazon Prime's so Sky could very well pick it (and most likely will) ... so to maximize their title-race/title-decider marketing point of view could put the rest of their mid-week fixtures on Tue/Wed and put us exclusive as the only LIVE game on Thursday ... they'd simply have to pick our Fulham game next weekend as well and put it on Monday night football (easily doable as that midweek is free - for now) ... or alternatively BT Sport could pick that Fulham game and put in on their Sat 12:30pm slot forcing Arsenal game to be on Tue ... (or PL might decide that's a good way to screw us and collude with the two TV companies to do just that, have us play on Wed for Sky and Sat early on BT) ...
So don't book nothing yet ... April TV picks get announced on 21st February; sit tight till then, any of Tue, Wed or Thu are all possible as it stands!