YOU sir, are one amazing person. No one else would even bother trying to find this information and put it together. And on that point, any information that's floating around is probably inaccurate. So thanks much for making this topic.
Could you please cite your sources with these so-called, "Facts"? For example where did you learn, "Hell will be a parallel dimension, and will be treated as another world..."?
I think we all understand that this place called, "Hell" will load up it's own unique environment, map and topography, but I have not heard any specifics on how it fits in with the actual Lore of the game universe. In other words, is this a completely different "plane", or is it located at the center of each Minecraft planet, and you are, in actuality, teleporting to it?
Hell is usually kind of metaphysical...
Hell is most likely physically far away (in the way that other galaxies are far away) but in a somewhat close dimension (if dimensions even come into play). Portals are wormholes? The reason distances are shorter in Hell between portals than on [Earth] is due to the outer and inner surface areas of time space being precisely similar, yet one around the other. Some general relativity time space folding stuff. It could be important to note traveling through a wormhole/portal could effectively place you far in the future. Or not, I'm no scientist.
Those Ghasts remind me of those kako demons in doom, or whatever you call them. (And I don't mean those flying skull things!) Just what we needed, Things that fly around and shoot fireballs at you and burn and destroy everything around you as well! I can't wait for this update!(And that's not sarcasim folks)
And those portals look sick!
(Don't yell at me for not being a complete expert on doom! I haven't played it as much to really remember what ALL the enemies were called. Yeesh!)