No, these last four eps are RTD's handiwork entirely.
I hate LotTL, so, I certainly don't want that kind of ending, but I did think it was a nice take on the reset idea - that fact that a limited number of people still lived that year, which has been explored in interesting ways in the fic communities.
Gotta love Dave Ross (Did you see the 'Vote Dave Ross 08 banner someone did? )
I don't think, from what I've heard, that it's going to be anything nearly as pants as '...and it was all a dream' only with sci-fi sounding cobblers. Golly, I recall the crushing disappointment last year, after Utopia and the Sound of Drums, and then LotTL played out and it was just so, so hopeless and depressing and cheesy. I knew I was supposed to be moved by what I was seeing, but I felt like crying with disappointment more than anything else.
I'm hoping for something between the proper scary of Parting of the Ways and the high emotion of Doomsday. With added fanwankery and big twists involving Donna.
I don't ask for much, me.