Right now the tech trees are very similar amongst the races.
We don't see that many:
- Racial unique improvements, projects, and things like wonders
- Only a handful of special techs (could use more than that)
- Limited special parts for ships or anything along those lines
- A "theme" for each race (Ex: in Twilight, the Drengin looked much different than say, the Terran)
I think that looking forward, there need to be bigger differences between the races.