We are again up to something… Big. 
We are replacing our sketch engine, and as a result, our Pencil interaction will be much nicer. Constraints and dimensions will work like a charm. You won’t have to lock your sketches, everything will stay in place. Dragging your sketches will work as expected. So it will be a brand new Pencil experience. We really excited about it, and we would like to give you the opportunity to give it a try before it is released. In exchange, we would like to get your feedback on it.
If you would like to participate in the beta testing, just post “Count me in!” below, and you will receive a TestFlight (iOS beta testing software) invite in a few days, hopefully tomorrow.