I did the Rachni mission last night. At least there were new kinds of enemies and lots of egg popping.

There seems to be a buttload of little super-lightweight collection assignments for people at the Citadel that end up giving you war assets - things that aren't identified anywhere on the galaxy map. Most of these quests are received by just standing around snooping in on their dialogue or a sequence of dialogs, and then picking up an odd bit of tech in the galaxy or approving something in on the Specter console. Odd.