On the Merian class science vessels he commented:
I designed the Merian to be a replacement class for the aging Miranda. Less crew, newer technology same diversity. Planck and Hawking will look reasonable the same, the Curie is a variant. The platform is very easy to construct and modular.On the USS Demeter (the fleet's airponic's ship) he noted:
I think the head of the design department for this project was an Andorian, at least the ship is going into a more "Andorian" direction.And also released this first look at the design:
The USS Achilles (the fleet's technical support vessel) will similar in shape to the Demeter, but have a utilitarian look.
Final he also revealed this look at the direction he is taking the Voyager refit (though was careful to note this is not the final design):
Commenting on Voyager he also noted the aerowing will be removed to make space for new slipstream sensors.
You can follow Mark's work on this and other projects on his blog.