Like i said other post:
This game do not need to do major changes from the original. It almost only need to improve graphs, original X-com was near perfection. The game should be almost exactly the older one, I do not like the idea of life, like ufo: aftershock, aftermath, afterlight, you can heal a lot in battle and it's not that realistic. Original XCOM almost all shots was a kill, the shot need to hit some body part like lag to not kill with 1 single shot, or later with armor, but a good shot still a kill, this was amazing, realistic and make you go like a real elite squad, with caution.
And it should have multiple bases and you choose the location. This the things that lacks in ufo:after(things) plus its getting bored with people thinking sci-fi with biotecnology only, the weapons and ships with biotec only, i dunno it's not that cool. But UFO still a very good game. I like the liberty in xcom 1, you put where you want as much as you want (to the max number of base). Creating liberty to do bigger groups more bases, you improve the diversity of possible strategies. As remind have more soldiers do not mean only benefits, you have bad things too. Sometimes in the older one, i use 4 soldiers, if i think it would be better, or if i didn't want to risk much in that type of mission, or if i want to use some missions to train lower ranks soldiers. I called training day. So it's a pitty you can have only 1 base. And please, take of quimical flare and put night googles.
Hope new xcom be like older one.