This is way OT for here, but with Scott8539's addition put atleast some Poser into it.

 Ok a few things to add to this. 

The reason for the Hendrex song, the stint with Starbuck and the 5 last models (no I don't think that they were revealed in that episode. I think the saboteur is messing with the crew) is probably going to come back to what they've been hinting on 'this all happened before and it will again'. There is a chance that they are going to write it as radio signals in space, but why just that song.  

Starbuck never died in the previous episode, she went to the place between life and death ala the D’Anna Biers (Lucy Lawless) cylon model. 

I think that they have 1 more season (after 4) I heard somewhere that 5 seasons was all the producers where planning to make. Also there is a new spin off (prequel) starting in 2008 I think. Which would follow Sci-Fi's SG1 plan, spin off a show before the other one reaches it's end. 

And will they find earth, I believe they will at the end of season 4 and then season 5 will focus on earth's reaction and the possible fight/integration of the cylons. 

An off / interesting twist would be if the 'humans' of earth were originally cylon/colonist hybrids that eventually evolved off their mechanical parts. So when the colonists get there they find that the 13th colony is actually descendents of both races. Lends creedence to the whole 'it's happened before and it'll happen again' stuff that they've been spouting since season 1

As far as being American-centric?? Not sure where that is coming from, but the show's new caprica stop has been criticized with being anti-iraq war in nature if part of the intent was to criticize a political policy then you probably should make reference to the political group.

I don't think it's American-centric at all, the military tatics used are common to all first world militaries, as already mentioned it was filmed in Vancouver (mostly because it's cheaper there.)

anyway thats my 6 cents worth. 

Ohh by the way, a little bit of trivia, the ship that  Admiral Adama distoried in the death of Starbuck episode was acctually a model ship on loan from a meusem peice and Edward James Olmos improvised that scene. The producers most of lost it. But kind of ironic that the cylons are wrecking a muesum peice of a ship (the Galactica) and then Admiral Adama does the same on the Galactica