Dragonics:
1. Yes, the concept of the Remnant has them pretty much zerg-ish, with lots of cheap but individually weak ships as opposed to the Xin with fewer but stringer units and Hegemony which fit somewhere in the middle.
2. I am not sure if there will be any new star types right now. There certainly are not going to be colonizable stars (though the new races will be able to build certain special structures in otherwise uncolonizable sectors).
3. I plan on incorporating Uzii's work in the Last Stand, with modifications. First, all the planets are going to be resized (enlarged) to fit better in the increased gravity wells. How much I cannot yet tell, I have to see what strikes the balance between looking good and looking how I would like it to look

)
Second, some planet types are not going to make it in. I find Uzii's work to be quite good, but certain types like Naval Base do not fit in so... also the planet abilities and bonuses are going to be revised where needed to fit with the core balance.
4. Big yes. Right down to ship icons and voice work (I am also doing that one myself - its kind of fun trying to make yourself
sound like an alien) - which is why this mod will take longer than usual to complete. For example, there are over 100 research topics to update and configure.
But, when its done, you will have a *completely* new race to play with, so in essence (I hope) it will feel like a free expansion.

Bss, of course there may be loopholes and balance issues... in fact I am counting on having them and having to fix them. Its pointless to try to catch all of them because other people will always use the system in the way you haven't thought of. That's what patches are for.

Anyway, when it comes to Quantum Gates, those are not going to be exactly sturdy... its more of an energy aperture in space-time continuum supported by a few fragile free-floating generators which are not exactly armored. So a fast strike team might zip through the sector defences and blow up the gate before the Xin can react. And the "in an eyeblink" thing, take that with a grain of salt... it won't be insta-travel for the Xin, just much faster than usual phasing. So there will be room to maneuver.