The film clearly shows all of the probes shot out of the Star Destroyer at the beginning going off in different directions, I'm thinking one for each habitable planet in the system.

We then see one by itself, head down to the planet and impact the surface.

A few minutes later we see another object head down and impact with the EXACT SAME SMOKE PATTERN in the EXACT SAME LOCATION.

I always assumed that the opening sequence happened, then we see what we just saw from Luke's perspective.

There would be a few ways to close this up neatly:

1. If its the same impact, leave it exactly as it is.

2. If its another probe droid, have more than one headed in the same direction and head down to the planet in the opening. Also change the smoke pattern and landing site.

3. If its just a random meteorite, everything about it should be changed (smoke, landing site, fireball).

Those are my thoughts on the subject.

(all shots taken from August 1's 1080p preview of ESBR)