Ok, I'm gonna try to rant about this without coming off as anal and a bit of an obsessive headcase, but that seems unlikely.
A nitpick that I always seemed to have was when people call "Raiders of the Lost Ark" - Indiana Jones and the Raiders of the Lost Ark... just.. no.. that's not the title of the movie. It seems to me that Lucas might be trying to alter the original title to fit in with the Indiana Jones brand- like he did with the DVD releases (even the standalone copies now say "Indy and the Raiders of the Lost Ark")... and you can bet that the blu-rays will most likely say that as well.
Does he really think that fans who don't see "Indiana Jones and the.." in the title would have no idea what it was? What is the reasoning behind this? Does it bother me? Yeah it does.. why does it bother me? I'm not really sure, it just bugs me. Now I can see that from a packaging standpoint in makes sense because they look nice together.. and I can honestly let that slide (though I prefer the original). It's the possibility of a real title change that would bother me. People could also draw comparisons to Star Wars: A New Hope and ask why that doesn't bother me as much, when that title was officially changed. Well, that was the original title that Lucas wanted in the crawl but the studios felt that it would "confuse audiences", so they scrapped it... Not to mention that the subtitle was put in when the sequels were announced, not decades later to tie it in with the franchise. Now, does that really justify anything about the change? I guess it depends on when you saw it and how you feel about that trilogy/saga as a whole... the timing and creative decisions are what validate that change in my eyes.
I don't want this to come off as a rant against Lucas because God knows there's been enough of those and I don't hate the guy like others do. I know that a lot of people will say "why care about this?" and "it's not a big deal" but I can't fathom changing the title of an iconic Hollywood film to fit with the rest of your merchandise... At this point it only seems like it's being used for cover art and not as a new title, so I don't want to set the alarms off. It's even listed as "Raiders of the Lost Ark" on the LucasFilm website, so I have no idea if he even wants this change to be official (but you really never know with that man).