I love the changes to the Warp-Jammer. I never used it, it was just too expensive knowledge wise, but now....
I'll try it out as soon as I find time, which is hard to come by unfortunately :-(
The new warp jammer is fantastic. Can you spot the warp jammers in this image?


The level 4 planet next to my homeworld is still there because I have a backdoor hacker as one of the opposing AIs, so I'm getting waves to my homeworld anyway. On the other hand, being able to not alert a core world is a fantastic trick for a warp jammer.
Incidentally, the new Parasites are pretty fantastic, too. I rolled the dice on my first ARS in that game and it came up Parasites. (One of the other options was Space Planes, and I forget the third, but at that point I still thought the leftmost option, in this case Parasites, was the one that would be default...) It varies depending on the units the AI is throwing me at any given time, but I think I'm running around with at least half a cap of every type of fleetship (except those immune to reclamation) the AI has... even without upgrading beyond mk. 2. (I keep thinking I'm "almost done" with this game, and they'll be much less useful on the AI homeworlds.) Well, okay, I did use Mercenary Parasites, too, but you always get those. You do need something to bring the DPS, but I think you could probably get away with never upgrading any triangle ship if you have Parasites as your bonus ship now. I'm not completely sure because this is only my third game, and the one with the smallest map, so far, but I've had a lot of fun playing around with all the ships. It's a great tool for getting a survey of different ship types.
(Incidentally, if you have any advice in the above picture, say, about which homeworld I should hit first once I take out the rest of the A shield group, I'd appreciate it.)
Edit: figured out how to make the picture more manageably-sized