Hmm...is A3 really A2 (as per the campaign list with A1 being the one where you fly a frigate)?
BP is divided into:
BP 1 : Age of Aquarius
BP 2 : War in Heaven
BP 3 : (Don't recall).
BP2 has been further divided into five acts, and released in the following timelines:
BP2 WiH Act 1 and 2 -> First War in Heaven release, in 2010;
BP2 WiH Act 3 (Tenebra) -> Second War in Heaven release, in 2013 (current)
BP2 Wih Act 4 and 5 - > Yet to be released
What it all comes across as is that feeling you get when reading a really good book...and getting asked to summarize it to someone that's never read a book in their life...or simply doesn't understand very well. Makes descriptions rather clumsy.
Try it though. I'm one of the school of thought that the only reason someone can't summarize something into a very short take is because he doesn't understand it as well as he thinks. I'm not trashing here, I don't think I'm able to do it too!
What I like most about War in Heaven is that it is the first very hard sci fi game that really takes its premises seriously and to its full extent, creating almost a new secular mythology on the likes of 2001 and so on (the inclusion of "Requiem" at the right moment really made my own day, as you can tell).