Wait just a second.
If this takes place 5 billion years later, after the Earth itself is roasted and destroyed...
1) How are there still human-humans? Cassandra was the last human, and though it later turns out that her claim left out the there were still mixed-blood humans running about, she was probably pretty close when she said she was the last pure-human.
2) There's still British humans and Scottish humans, and they are still so racist against each other that they go off in their own ships? Considering both these places are in the United (irony on the word "United, I suppose" Kingdom, it feels like America launching a Whites-only ship and a Blacks-only ship. Pretty disgusting on one sense, and not realistic on the other (I can't imagine there's any distinction of British or Scottish this far in the future. Certainly not in the almost old-timey way it appears to be portrayed.
3) Why are we still mucking around in RTD's sandbox? This whole "End of the World / New Earth / Year Five Billion" era was his little thing. The Doctor went there first with Rose, again when he regenerated, and again with Martha. I am pretty sure I heard RTD say he wanted to visit this year at least once per season (I believe a trip had been planned with Donna but scrapped). Seems like Moff needs to make his own playground.
Just some thoughts. Still looks cool, and still excited to see it.