I don't agree the writing is homophobic the character of Aaron is troubled and has his long standing issues the thing I liked about how they did Aaron's coming out story in 2009/10 was they showed Aaron to be true to his character and didn't feel the need to change him (sex him up etc) just because he's now gay it showed him to be a real regular person true to his original character the show got real praise for not being stereotypical with him him and the story.
Aaron as a character seems to suffer depression or something along those lines & they are doing a storyline now with Gordon to address why he is like that & we are going to learn about Aaron's past & childhood.
Aaron's self harming is being done quite realistically because suffers of self harm usually battle with it for years & most of their life time but it doesn't just go away overnight the frustrating thing about it for me is they & certainly this year bring it up as a plot device without any decent follow up (such as when Aaron was doing punishing running following Katie's death then he suddenly stopped due to injuring himself yes but without either treatment or explanation - his issues just went away because they wanted to move on storyline wise) I hope this time they give the attention it deserves by getting him support & proper treatment.
The new producer will have his own ideas but he's not going to turn Emmerdale into Hollyoaks even if he worked there previously - Emmerdale has a different format & it's likely he'll stay true to that I doubt he'll radically change the show.
The writing is done months in advance the new producers influence will likely be shown on screen Easter time at the earliest I would think.