of course I do not know what scale you are talking about, but I'm pretty sure there will be a handful of new research topics.
for example to unlock those new ship classes, maybe a few things associated with starbases, then definately the various upgrades for gauss canons, hangars and their counter parts and the other new additions such as minefields and subspace inhibitor. it will not be a whole new research tree, but there is definately some new techs in the game with entrenchment based on what I read.
btw. the third mini exp. was said to include more new ships, techs and stuff too, so you could look forward to that as well.