Work next to Cathays station

Hey all. So on my daily commute, I've seen an increase in works next to Cathays train station. Now they have diggers and the lot on site. Does anyone know what they might be working on?

Is this on what was once the gravel car park next to the station? It's going to be the new school of mathematics and computer science. Here's the planning application that was approved https://planningonline.cardiff.gov.uk/o ... APR_124878