I think Allert is pretty busy with his company.
Velomobiel are building an additional production facility in Breaza, Romania.
Their product range is also expanding - filling niches in what is already a niche-market.
velomobiel.nl blog | Weblog van Velomobiel.nl
I wouldn't be surprised if Allert also had a hand in the design of the Evonik Wind Explorer, which looks a lot like the Velomobiel DuoQuest.
http://www.wind-explorer.com/