Had this given to me shows the plans for callanghan Square. Platforms will be in.the car park on.the South Side of Cardiff Central Station. A multistorey car park is being built along with a coach station.
That may have been
an official plan, though its source is unofficial. There is a more recent plan in
a presentation of Mark Barry's from last year (he's an advisor on Cardiff Metro). I can't link to it, but it shows (at p45) two new tram-train platforms outside central station, partly on the current car park. The track then goes through Callaghan Square and joins the Cardiff Bay line.
That fits the words just released better:
Phase 1a
This phase is fully funded and will require a significant redevelopment of the highway network around Callaghan Square so the tram-train can connect onto the existing Cardiff Bay train line, as well as a new tram-train platform at Cardiff Central.
There will also be a new public realm in front of Callaghan Square, a new segregated cycleway to connect Cardiff Central with Callaghan Square linking with the wider strategic network, and changes to the access arrangements for general traffic through Bute Terrace and Lower St Mary Street.
But plans do seem to be still subject to change.