I edited the available footage and created a continuous video that is perfectly synchronized so there is no time gap or overlap. This gives a better idea of how the speed of the aircraft varies throughout the runway. The second half of the video is the same thing however I don't use one of the camera angles as it overlaps another.
http://www.youtube.com/watch?v=oT2RLbHz-rI
After a analyzing the video (using reference points, etc) I found that the aircraft speed remained mostly unchanged at around 60 m/s or 216 km/h.
This was recently confirmed by Infraero who claimed the plane touched down at 110 knots (~ 200 km/h) and left the FOV of the last camera also at 110 knots. (source: Globonews TV)