well if any guess its got to do with the other movies releasing so giving a spread out timespan as to avoid losing sales against other big name movies or something

Friday is rare for DVD releases. So, it's not like you're gonna see this often. And you're definitely not going to see the industry move to a traditional Friday release day over Tuesday.

Big studios just do this from time to time with very major releases. Usually you'll see it occur on a week when you have no major theatrical releases either, since that's part of the reason Tuesday is the traditional date anyways (so as not to compete with theatrical releases).

Friday releases on occasion just allow the studio to give a certain "special" status to their DVD, making it seem like a more prestigious release.

On that note, I do have to say this is a very quick turnaround from release announcement to actual release date. Usually, especially with major releases like this, they announce it like a month or two in advance.