Keep in mind Aaron is just one guy making the game, so for him to take time out to write diaries, post info, do PR, etc. cuts directly into the time spent on SE:V.
Another factor is the additional support he had to make for SE:IV and Star Fury for their launches with Strategy First.
I think once the game is nearing completion, you'll begin to see more concrete information.
Fyron keeps a good record of screenshots and a record of game previews etc. by other sites on SE:V here:
http://www.spaceempires.net/home/gameinfo-SE5.html
I also maintain an update list of purported features at my website:
http://www.captainkwok.net/se5info.php
There's plenty of information you can use to project what the game is going to be like, particularly if you are knowledgable of how things work in SE:IV.