I am not wholly convinced about the XXL engine, but that may be my limited experience with it. I don't take that much issue with the slight loss of survivability, since on non-zombie designs, once the torso is breached, I consider the mech done for the day in most circumstances, and try to pull back, and situations where a mech with a Clan XLFE or IS LFE would survive where a larger engine would not seem like edge cases. I am not so sure if the weight and heat is worth it, though, especially when you consider that the extra heat will occupy 2 tons worth of DHS (assuming run as the default movement mode). Also, given the extra vulnerability of that engine, I question what good the armored gyro does.
As for Ferro-lamellar, put that on everything, the weight loss is a bit of a hit, but with smaller ES and XLFEs as well as generally smaller equipment, clan mechs can take the space loss generally, and the added survivability is really nice. Also each armor point is at least worth 1.2 armor points of other armors, so it's not not as much of a weight loss as you might think, and like hardened, actually lets you pack a bit more survivability on if you want to max out your armor weight.
The New vulture seems reasonable, though.
If anything, really; what I want to see is redone IS Omnis. The clans have been getting new omnis that are fairly decent for a while, but the beyond the totem omnis and Celestials, the IS doesn't have too many actually good omnis. I am hoping to see the Celestials get the same treatment the Bolla got: a RotS version, has standard C3 and slightly tweaks the pod layouts for IS combat doctrines, but otherwise just as capable, and I want to see stuff like an Owens II to give me a scout omni that is actually dangerous.