It looks as though Jack Jones is moving into the unit next to USC on the upper floor of SD2. The unit they currently occupy is to converted into 2 smaller retail units facing the main arcade and one further restaurant unit facing Eastside. This mirrors what is happening on the upper floor where that corner unit is being converted into A3 for occupation by Shake Shack.
I think it makes sense. It has looked for a little while that SD2 is struggling for retailers but is very popular with eateries.