It wouldn't be that difficult to do spear/or polearm combat...I too ,do not know anything about game development. Spears mainly thrust or are thrown,oblivion had thrust animation,you did it with your last perk with blade,it also did it with the backwards power attack with two handed weapons. Combat and animations have been re-worked,they will be miles better,you will not need separate combat for spears/or polearms. And if we can thrust swords through a persons chest,whats stopping a spear or polearm doing that?....all you need is a thrust animation,which skyrim will have.
I think spear lovers are worried about nothing...but thats my opinion,we'll have to wait and see.
In addition, a thrust animation for a two handed pole weapon could also help staffs to be actual weapons to be fought with. Getting a stick jammed into your gut is not healthy, whether it be pointy or not.
Also, swinging animations wouldn't be totally alien to spears. Getting cracked in the head by a 5 foot long pole is very deadly, what with leverage and all. Just a small force applied to a long stick, at the end, becomes a very strong force.