Its press release says that
The UK Radioplayer, due for launch early next year, is a pop-up console which will be open to stream more than 400 licensed national, local, community and student radio stations, offering a unique, constantly updated live and on-demand audio service.
So unlike the I-player which the corporation was prevented from sharing with other broadcasters,however as Paid Content reports
the BBC isn’t yet submitting UK Radioplayer to formal trust approval, believing it’s not a new service but a marrying of existing technology backends. That would avoid scrutiny for public value and market impact.