Basically. It would indicate that the DNA reports received back by the defense do not support their defense theories or what they will be arguing at trial. It does not mean that what is there is evidence against the defendant. But it could just as easily be no clear evidence found either way. In which case the defense team certainly does not want the prosecution digging through their expert reports looking for something to use against them.
I'm betting that either no viable dna evidence was recovered, or what evidence they did find was limited to the primary players in this saga, Caylee, KC and the A family, who would have come in contact with the tested objects on an everyday basis. In other words they did not find DNA from anyone such as RK, JG or some other mysterious scapegoat to use to spin things.
Ultimately the only conclusion we can draw from the missed deadline is that the defense does not plan on using that DNA evidence at trial. of course given the sloppy and haphazzard approach of thise defense team to deadlines and such, that may be completely untrue as well. The may be planning to use it, but assuming that it will be let in at the last minute for some absurd reason such as the mailman got lost.