In my opinion Grim dawn is the best Arpg since D2:LoD. My most favourite char in D2 lod was amazon and jawelin/spears combined with shield looks amazing and its only playstyle I miss in most Arpgs since D2(Titan quest had some spears, but lack of skills for them).
Will be possible to bring those weapons in to Grim dawn?
I doubt it. They simply don’t fit the devs’ vision of the game.
We need whips! Whips and codpieces! 
I am going to be trying to put spears (as well as staves) into my mod (Grim Quest) and perhaps release a standalone version as well. Maybe keep an eye out for that if you don’t mind playing mods.
-
i Played TQ and IT for far more than 1000h (school … couldn´t do that now that i´m working) and i played a lot spear chars. i Didn´t sense any missing skills, (i dont know the english names) Jagd (hunting?) and Gaunerei(?) for example had very good working skills for spears.
-
in TQ spears were the possibility to combine armor piercing with meele weapons and a slow basic attack speed (wich makes the damage per hit even higher what can be used to push the damage of skills that inflict a percentage of a normal weapon hit). in GD there are 2Handed weapons being slow and 2Handed Swords also have some armor piercing. Just like the Nightshade’s Reach i found recently. This is in my opinion better balanced then spears, because spears could do some extreme damage while having a shield in the offhand and being defensive enough to tank some of the really hard bosses (undead Dragon, ect). 2Handed weapons can do a lot of damage even while having some defensive possibilities (see Warder) but they dont feel that overpowered as some of the old spear builds did.