Tennant has suppressed his Jock accent for the Who part. I'm not sure regeneration requires acquisition of a new accent beyond the expected voice change. Will yer man Nesbitt be up to suppressing his accent? It'd be bloody funny if the "new" Daleks acquired a Rev Paisley accent!
I wasn't overjoyed when I got this news but not on grounds of accent - I love Irish accents actually, north and south - but just because I don't particularly fancy him. More interesting (to me) actually is the debate about who will be the first woman Doctor ... now there's a thought ... any suggestions??????????