This is not new. When the Grand Jury heard the evidence even before Caylee was found, they indicted her on First Degree Murder which means premeditated. OCSO arrested her on those charges and stated then it was premeditated. INTENTIONAL.
Why be surprised at something we already knew to be a fact in this case? If there was not enough evidence, they would not have brought the charges. Now, with the body and further evidence of the timeline, they only have solidified the state's case against Casey. The growth of plants and bug evidence only played the role of determining how long Caylee's body was left in the field where she was found.
I believe the reason they are leaking this information now is due to the motions Baez sought in court yesterday and knowing they are going to have to release certain information out to the media (doc dump).
I can't understand why people don't realize yet that when "sources" come out with this type of information, it turns out to be correct and was intentionally leaked by LE for a reason. This has happened repeatedly in this case and they haven't lied yet. I have had no doubt that Casey killed Caylee intentionally...because OCSO, the FBI, and the SA's Office said she did and they have had evidence to prove it. (I have believed it since I saw the words, "31 Days" tho.)