Were the flags outside Maz's temple changed for a reason?

Question

Attached are two pictures, one from the trailer, one from the BD release. It shows that the flags outside if Maz's temple have changed, specifically ones from the prequels.

Two things come to mind:

1. Are we certain that these changes were intentional in the BD release and not something done as a result of refining the unfinished digital effects from a trailer? One reddit user with a pirated version of the theatrical release confirmed that the flags are the same as that in the BD release. Meaning that the flags were done differently in the trailer, then edited in post-production for the official releases.
2. If they did change these flags intentionally, what might be the reasoning? This question still holds water. Why include prequel flags in the trailer and then edit them out of the official release? Are the editors and SFX teams just toying with the community? Creating Easter Eggs for what would undoubtedly be one of the most anticipated set of trailers for the year?

Extended Question: What are Disney's long term plans for the pre-OT time frame? We've already started with Rogue One happening before the OT, but after the prequels. Is there a possibility that Disney could reboot the prequels with new actors, screenplays, directors, stories, etc? Speaking of, what are Disney's rights with the existing properties?

Current BD release version

Trailer version

Anakin's pod racing flag, removed

Edit: photos from imgur user ERAUAerospace

Answer 1

The flags were changed at the insistence of JJ Abrams because he wanted to divorce his film (as much as possible) from the Prequel trilogy.

Abrams, fresh from his speech about the importance of details, sits at the center of the editing room, at a computer set-up that allows him to draw with a stylus on images on the big screen in front of him, doodling on his own movie – at one point, he jokingly draws a Coors logo on a snowy mountain. Effects supervisor Roger Guyett and Kennedy are on a conference call from London, watching the footage, and Abrams' scrawls, on their own screens.

They begin by reviewing a shot shown in the trailer, where dozens of flags appear on a castle that belongs to Maz Kanata, a mysterious little goggle-wearing creature, played by Lupita Nyong'o (12 Years a Slave) via motion-capture and CGI. The flags are designed to drive superfans nuts with references to the earlier movies, but Abrams tells Guyett that too many of them allude to the first of Lucas' prequels: "I don't want to be too about podracers," he says. "I'd rather come up with our stuff." - _{^{Rolling Stone Interview}}

As to why they were included in the first place, the simplest answer seems to be that LucasFilm brought a large number of props with them to decorate the castle. This included the flags from the original films.