Early thoughts...
Some small nice changes/additions/bug fixes nothing hugely exciting if I'm honest but it's patch between DLC/expansions that's standard I guess (not a criticism).
Issues and wish list...
I really dislike the slider, it's a micromanagement time sink reminiscent of the awful wheel system in GCIII. A couple of extra buttons options would have been nice/fine I didn't really have any major problems with the old system. With the slider I'll end up tweaking it every turn for little benefit, very annoying.
There been some changes to the rally system a new button added. Personally while I use rally points a lot, I don't use the "go to" orders because the ships gain a 50% move bonus when within your territory but with the existing "go to" orders ships often end their move outside of your borders frequently meaning they lose the move bonus and take longer to get to a destination. If you could set a ship to move to a rally point and then immediately have them move to another rally point automatically on reaching a rally point I would use the rally feature extensively and be very grateful for it as it would be a huge time saver. Currently if you use "go to" orders especially over long distances you have to forgo playing optimally.
Speaking of ship movement in 2.8 I'm sure the +3 movement finisher was bugged it works once but doesn't stack on future researching. Bit of an issue on the crazy size maps I like to play.
I didn't see anything regarding a post Warlords AI update. The AI only builds fighter, bombers and cruisers (no Corvettes, Destroyers etc.) and I think the battleship very late into the game. Each ship type always uses the the same tactics and targets making them 100% predictable and easy to counter.
If each AI was building every ship type available to it and each AI favored certain tactics and targets and equipment it would make the game so much fun an interesting to play.
It's great giving the player cool new things to exploit but if the AI can't or won't use them it's actually a big issue. The AI is at a huge disadvantage currently in this area to a barely competent player.
More options in the galaxy setup screen. I'd rather not have to resort to modding to generate the galaxies I like to play.
No buildings that can't be destroyed (annoying) and a way to filter the buildings in the planetary menu. Also a show tiles switch without any buildings, it's hard to tell what's underneath when something is built on a tile.
Thanks/Diolch