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Beam is 20mm so 0.5mm smaller according to the site.
It's just Yonex' way of measuring beam width. The Duel G 97 has the exact same beam width acc. to the Yonex site (20.0mm / 20.0mm / 20.0mm) so it'll be 20.5 mm on TW.
On the pics of the new VCore Pro 97 the mold looks exactly the same as the DG97, so my guess is that the major diff. the playtesters will notice, is the 16x19 pattern (since it looks to be similar to skipping the top cross on the DG97).
Reg. the PD comparison made in a post above:
I haven't played the previous models, but I have extensive playing time on the DG97 310 and 330, and compared to a PD/DR100/APD, it feels super solid and flexible. As part of my TE recovery I went back and forth between the DG97 330 and DR100, and I could not believe how flexy the DG was after playing the DR100 (the DR100 was not uncomfortable or stiff, and the DG felt super solid, whilst being flexy)