No shortage of speculation here!
That's quite understandable and predictable. Some of it even makes some sense if you assume a couple of facts that are not yet in evidence. We shall see which of the speculations are on point once a few more things have been established as fact.
There is a high probability that physical inspection of the wing at the point of separation/failure will reveal the means by which the structure was induced to fail. Evidence of corrosion, fatigue, overload or overheat will remain at and near the point of failure. Examination of the engines will reveal whether or not an uncontained rotor failure and case rupture or any other occurance caused a fire. More video of the aircraft flight prior to the wing separation may come to the attention of investigators than has been seen on television so far. If the installed CVR yields useful audio, crew conversation and background sounds may be of investigative value. The focus of speculation on the causes of this crash will be narrowed in incremental steps as the NTSB releases individual details of it's initial field phase inspection and subsequent lab analysis of recovered components. A press briefing has been scheduled for 19:30 EST at the Biscayne Bay Marriott. Perhaps some useful information will released at that time.
Westhawk