Just a hunch
I could be wrong, but you know how Episode 4 was really fuckin' short? My theory is that maybe episode 4 was kind of a breather to get us ready for episode 5, 'cause the promo for episode 5 looks like there's a lot of shit to go down in it. Also, at the end of episode 3, we were all shot up and got our arm snapped. Plus, the wait time for TTG to put out ep.2 after ep.1 was like 4-5 months, and the time for ep.3 after ep.2 was 2 months, and then it took 1 month to make ep.4. I understand they have TWD, Borderlands and Game of Thrones on their hands, but I just hope they take their time with the next episode because i'd rather wait 2 or 3 months for a long, thick, overwhelming episode then have a short and underwhelming episode come out in like a few weeks/a month.