In terms of the fabricators and mark IV factories, those are seeded the same as always... but that's heavily random, so it will vary from game to game in general (always has).
If you say so I believe you, but the game does give me a different feeling. I had a game, that I already restarted with the different patches, that had a mk4 fab and some fabs (+ some Golems) in a certain number of jumps from my homeplanet (seed: 1890136718 - x-map - E-bomber starting planet). Each and every reload it was the same (though the exact fabricator/golem changed a bit here and there). Now all I get is a lvl4 fab, no golems and no fabricators. Less AI-eyes to squash to get there, but again twice as many counterattack posts (several planets with 2 of them on there )
Well, the exact seed might be different now, for sure. The explanation for the above is that when we changed the seeding for some of the other stuff (eyes, fortresses, etc) that affected any random operations that happened after that in the galaxy-creation process, since it's a linear thing.
Basically, with a random number generator given the same seed (your map number), it will always give the exact same sequence of pesudo-random numbers. So if the sequence is always 2, 4, 5, 1, 10, 13, 2, 4, etc, then you always get the exact same map. However, if the first number is used for forcefields, and it actually now needs the first two numbers, then everything else gets slid down the random chain a bit and you get things like golems or what have you seeding differently given the same seed.
All that's to say that seeds will be different, but that it's not overall harder or easier (though it will certainly be harder or easier per map, as always).
edit: a question I wanted to ask but forgat, do the counterattack forces now spawn in 1 of the 4 corners of the planet? Or did I just happen to see some unintended spawn-ins? (I like it, but it did make me defend the wrong corners )
I'm not sure, but I believe so.