Did they dump/drop support? No. Basically, AOKPJB Milestone1 was the last release for Android 4.1.x. All the next nightlies/changeas are based on Android 4.2 which the Galaxy S2 dosent even have a booting base, yet. 9100 dosent have a bootable 4.2 base yet up till today as we speak. Just look at other Exynos4 phones/devices, are any of em running 4.2 yet?

What Bajee and Pier did was mantaining/patching/fixing to make AOKPJB till milestone1+ on 4.1.2 possible (and official) with the ready booting base worked out by hacksung and also other devs which contributed (too many to be named, or im simply a goldfish). On the other hand, Android 4.2 has a lot of core changes and Samsux didnt even release a JB source for us yet. While initial JB for our phone sucks with hwcomposer issues that forced hacksung to use ICS blobs and stuffs to make it partially dirty working, in 4.2 google dropped legacy support and changed even more to hwcomposer.

Just pray and hope that TeamHacksung managed to get a bootable Android4.2 and there we will see 9100 getting latest AOKP stuffs. For now, we are stuck at Android4.1.2. or perhaps someone like bajee would backport those 4.2 stuffs to our 4.1.2 aokp. Miracles happen btw. Peace!