This is all guesses, so don't hang your hat on anything mentioned here. Plus there's a thousand of variations that could fit as well. We'll all find out the hard facts soon enough.
|Michael Hammer presentation|
It must be that they are able to show three distinct ethnic source groups (Quellengruppen) that collided in the territory where three great rivers come into close proximity, these being the upper Rhone, the upper Rhine and the upper Danube. (or a process involving the three, regardless of the geographic location)
Since Vucedol 2.0 extends past Prague, it's reasonable that a nation of its size was trading heavily with other groups in this European flea market to an even greater degree. The confluence of cultures would have included cultural sources from Northern Italy, the lower Rhine and certainly those trading up the Tagus and across the Pyrenees.
As trade often intermixes more than objects and opens avenues to migration, it's possible the trade avenues, the trading outposts, or even the trading caste, came to be dominated by an emerging class of people with this mixed background. The roots of L23* make a lot of sense in this regard, being in the Upper Rhone and then back to the Western Black Sea area.
Perhaps this is what they have discovered, one or several of the following:
1. They are able to show in burials of the Vucedol Culture that its most expansive elements in the West are found the earliest representation of the Atlantic Modal Haplotype which came as a direct intermingling with Western Yamnaya.
2. This Vucedol 2.0 nation or its trading posts extended in a meaningful way further than Prague along the Danube to a point near the Upper Rhone and Rhine. Perhaps within these trading families or cartels the highest status males (the metal workers) began to dominate these kin groups.
3. The diffusionist and dual origins of the Beakers are proven or disproven.
4. Maybe they are also able to demonstrate that the Wessex/Middle Rhine Group is more directly descended from the Yamno-Vucedol group. They may show that some of the NE Scotland Beakers are R1a.
5. They show a strange situation where the Maritime group results from another related process...I'll leave that alone for now, but will remind of the amphibious nature of the Beaker phenomenon from the beginning and the coastal defenses erected in Portugal.