I watched this weekend both Suhl-Aachen (Saturday) and Münster-Stuttgart (today). Jamie Morrisson attended both matches..watching many Dutch players on court.
My gues for 2018 wide-roster:
Setters: Dijkema (Firenze), Stoltenborg (Stuttgart), Bongaerts (Aachen), ?
Opposites: Sloetjes (Vakifbank), Plak (Novara), ?
OHs: Daalderop (Stuttgart), Balkestein-Grothues (Casalmaggiore), Pietersen (Modena), Buijs (Nilufer), Jasper (Dresden) ?
MB: De Kruijf (Conegliano), Beliën (Bursa), Polder (Aachen), Stoeten (Aachen), Koolhaas(Bucaresti), ?
L: Schoot (Dresden), Knip (Aachen), ?
I expect some girls of Dutch Youth Team, to take the ?-spots.
The most important thing will be Judith Pietersen's return, after finishing her studies. Presumably it means, Jasper will not be in the roster for the big tournaments..