Rather strange changes to the throwing lance, imo. After playing a bit on siege my conclusion is:
melee:
Slight nerf, but really not much has changed, it's still a decent melee weapon, just not as blindingly fast. The 2 points of damage buff on the swings helps against glancing, the one weakness the old version had. Still for loosing 4 points of speed and 1 point of pierce, I would have expected more than just the 2 points of blunt. I didn't really notice the extra weight, myself, but I wear an unusual amount of armour for a throwing lancer anyway.
Ranged:
Big buff, not much has changed, except you have 2 more ammo and you're far more accurate. You don't one hit anything but peasants and archers, which is the same as pre patch. Still a throwing lance to the chest and a swing from a nearby friendlies big weapon is still often enough to put down a medium armoured enemy (again, the same as prepatch).
Pre-patch the throwing lance was (imo) nicely balanced, both modes were decent, but neither was very strong. A lancer trying to melee a dedicated melee build would lose, just like a lancer trying to out throw a dedicated thrower or archer would lose. It was only when you used both side to good effect (especially near teammates), that the build would fully come into it's own.
Post-patch the ranged side of the lance is noticeably stronger, while the melee side only received a slight nerf. The slot change was also an odd choice of buff, compiling on top of the already strange changes made to the weapon, since now you can have 6 lances and a 0 slot sidearm. So the throwing lance has really received an unneeded buff.
My recommendation as someone who has played a dedicated throwing lancer for 3 years or so: Revert the slot change, revert the ammo change, weight change I'm ambivalent about as long as it's adjusted to ammo count, keep the accuracy change (maybe a bit less accuracy than it has currently) and give back, say, 3 or 4 points of ranged damage, keep the melee changes, except give 1 more point of damage for blunt of pierce.
Small side note: as I was on siege, I didn't get to test the lances vs cavalry. Maybe the damage nerf makes a bigger difference against cavalry than it does against infantry. Still, I don't expect any sane cavalry to try and charge a lancer head on.