so we expect to find teeth from early cemetery and search for DNA?
Well, they've found bodies in the Philistine cemetery. Whether they'll be able to extract dna from them, especially y dna and autosomal dna, which is harder to do, is another story. People think it's possible to get it from every set of ancient remains, but it's not.
Let's suppose that they do. We'd need ancient dna from Aegean Islanders of that time period to see if the Philistines match them better than they do Bronze/Iron Age Anatolia, as one example.
What if those two other ancient people are not that different from one another, although they're a bit different from Levantines of that period? What then?
It's true that there's Aegean pottery at the sites, but pots are not always people, as we've learned over and over again. Now, physical anthropologists have done reconstructions of the Philistines versus the native Levantines, but as with all reconstructions I think the artists' preconceptions or biases have some part to play.
Ancient dna results have been surprising in one way or another, so we'll just have to wait and see, I guess.