The special edition will also feature recovered footage not seen since the original broadcast.
According to Radio Times,
this new version of the serial will feature a 'lost' piece of Doctor Who history – while the Second Doctor's regeneration into the Third Doctor (Jon Pertwee) originally took place off-screen, the special edition of The War Games will depict the changeover on-screen.
and
We're also promised the new release – which will air on BBC Four and be available on BBC iPlayer – will feature "recovered footage not seen since the original broadcast".
A regeneration is cool, but I hope they go fairly minimalist with it. I like the more...explosive regenerations of the modern era well enough, but I don't think they need to be retconned into past ones.
I really hope they'll do the old fade-aroo like in classic Who...
Oh no wait — after the 60th specials RTD was raving about all the past regenerations potentially being bigenerations? And 2 into 3 was always the vaguest?