Perhaps I am hearing things, but if the end-of-episode preview is correct, D’Anna (Number 3) has fingered the last Cylon, and it is yanked the viewers’ collective chain:

Laura Roslin

Laura Roslin.

And here I was for a moment thinking that it would be Felix Gaeta, opera singer.

So, to review, here are our known “Final Five” Cylons:

Laura Roslin - ??? -
Saul Tigh
Sam Anders
Tory
Galen Tyrol

And the “numbered Cylons”:

1) Brother Cavil
2) Leoben Conoy
3) D’Anna Beirs
4) Simon (the Black Cylon)
5) Aaron Doral
6) Gina/Caprica Six/various clones
7)
8) Sharon Agathon/Boomer/various clones
9)
10)
11)
12)

Now the only other wrinkle I can think of us that in this week’s episode, we find out that Col. Tigh (presumably) impregnated the Number Six cylon in the brig… according to BSG lore, Cylons cannot make baby Cylons - so that may yet cast doubt on Saul Tigh’s “cylon-hood”.

I must admit, this season is head and shoulders better than the others for how they are working the plotline.