Much as I hate to be a killjoy, I think the most significant thing is that this new episode will not be written by Grant & Naylor, but Naylor only. The last series of Red Dwarf was also only written by Naylor, and really it was not nearly as good as the earlier series, written by Grant & Naylor together.
Not to mention the fact I have doubts about how well Red Dwarf will age - much as it was a fantastic series in the late 80s/early 90s, a lot of time has passed since then.
But I am prepared to adopt and 'wait and see' attitude. It might prove me wrong and be wonderful.
Shara