Hey Jim,
Chatting with the team, I don’t think we have any plans for closed loop motors on the LongMill in the near future - generally we’ll be limited in our travel speed due to the leadscrews whipping around so there’s some diminishing return on spending money on closed loop motors that can spin faster.
As far as a smaller AltMill, yeah there’s been a lot of interest in making a 2’x4’ sized AltMill so I wouldn’t be surprised if we did this at some point. No timeline or promises though!! 
Cheers,
Stephen