No no no no no. No, Enough!
I know that story was wrong, but just in case anyone associated with BBC Wales happen to be reading this, please, No!
As regards a multi Doctor story- that would be great at some point, but not so soon after a regeneration- we need to get to know the 11th Doctor, and get used to him (and maybe even the 12th if he doesn't stay long) so that the current Doctor is the one everyone identifies with and the others are nice bonuses- and that we (the general public rather than we obsessive fans) need reminding a little of what they were like. The reaction should be an 'oh, I remember him (and him, and him), great, this should be good' rather than a 'now the proper Doctor is back'.