As I've explained in the past Ghost Solution Suite has been scheduled to "go away" in favour of Deployment Solution for a long, long time, as that's a part of our roadmap that we laid out to customers at ManageFusion '07 in Orlando.
The classic Ghost cloning tool (which also has RDeploy-style multicast as an option since RDeploy was deprecated back in '07) and DeployAnywhere (but NOT the Ghost Boot Wizard, except for the small subset of it which manages drivers for DeployAnywhere) were internally bundled together as the primary cloning toolset for Deployment Solution, and those pieces have a longer lifetime. The team who currently maintains GSS primary focuses on that subset, and if freed of the need to maintain GSS proper they ought to be able to keep that subset viable for use in DS - they are good developers, just ludicrously underfunded just as we were.
While we at Ghost HQ had always wanted to tackle HFS+, we had done all the necessary research and knew exactly what it would cost to build, but we simply weren't going to get that funding. In particular, since Deployment Solution has some (very, very, lame) support for MacOS management using the Apple toolchain, that's evidently been considered sufficiently adequate that the modest funding for a native HFS+ imaging tool was not going to be forthcoming.
As for PXE, MacOS X firmware supports something different called NetBoot, and you can't use a PXE toolchain for NetBoot (at least not without it being specifically designed for that). As it happens, the last thing I did before being laid off by Symantec was work on SBS (which is what is bundled in with DS), which I started to tackle by completely rewriting brand new PXE and TFTP servers that ran over 10x faster and supported at least 10x more clients than existing SBS, and my intention with that was to also include NetBoot support. Unfortunately I was laid off before I could finish the DS integration for that, and so I don't believe any of that work has or will ship - the likely scenario for DS is that it will continue to support NetBoot the same way it supports HFS+ by requiring customers to use the Apple toolchain.