"A spokesperson for the department told the BBC that both MPs will hold the post, but that more information on how that works in practice would be announced in “due course.”
They also suggested the title of the posts could change but that a final decision has not been made."
Sounds suspiciously like Labour may be harkening back to Harman in 2010 when they were discussing that the ministerial position is too important to be pushed into a sub category to be handled by one person who is also full time on another.