There have been quite a few updates recently, because one of the developers (John Joseph, who pops in here from time to time) has taken a personal interest in it. I do think there are a couple loose ends, like although you can now open a cell in the Loop Construction View for editing, you have to save the file and import the changed file. Also you can open a MIDI cell in the Step Sequencer, but you need to stop/start to hear any edits...not a huge deal, but I'd like to see it more seamless. There are also some sync issues with synth arpeggiators but overall the improvements are really welcome, particularly the "partial drag" option and the ability to drag and drop multiple clips.
Anyway if you haven't checked it out the Matrix lately it's worth checking out the improvements. I'm glad that it's getting some love.