This has been spoken about by the government in parliament for a while. Tory Robert Halfon has been an a campaigner on the 10p tax. The Treasury have been looking at it but I don't think it is proving to be as viable as taking the tax threshold higher, which is happening over this parliament.
It has been established that to fund the 25 million tax payers Miliband has said it will help, £100.000 will have to be taken from each home worth over 2 million. More figures may and will come out to contradict or affirm I am sure.
Also Miliband refuses to put it into his manifesto for the next election. Also the 'mansion tax'. He has been categoric on that question.
Watch Andrew Neil on todays BBC Daily Politics show talking to Ed Balls. Very good.
I did like the way he threw Gordon Brown under the bus, whilst accepting no responsibility himself, nor Balls and yet they were right hand men of Gordon Brown helping to make financial policies.