Well, you used to scale armor into AD, which did do damage to towers. What I mean is, he was always a surprisingly good splitpusher. I guess now with the AS oriented build being slightly more viable and R having more interaction he's even more dangerous, but not by that much (the increase in ult damage is 15/30/45 +10% AP per second and he loses the increase in AD).

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[Removed] No longer gives 25% of armor as AD
[New] Rammus deals 8-20 (+10% Armor) bonus magic damage with his basic attacks.
Puncturing Taunt Frenzying Taunt (E):
Renamed from Puncturing Taunt to Frenzying Taunt
[New] Casting Freenzying Taunt grants Rammus 20/25/30/35/40% Attack Speed for the duration of the taunt.
[New] Frenzying Taunt's Attack Speed bonus constantly refreshed while any of Rammus' other spells are active.
[Removed] No longer reduces the target's Armor by 5/10/15/20/25
Damage reduced from 65/130/195 (+30% AP) to 40/80/120 (+20% AP)
[New] Slows enemies in damages by 8/10/12% for 1.5 seconds, stacking up to 8 times
[New] Deals double damage to structures
As you can see, quite some changes, but I want to focus on mainly that he now has an AS-Steroid which is rather strong and an on-hit effect with his passive. Rammus can abuse that with some new items and also fix issues with others:
A quick note to enemies: Do not let Rammus splitpush with this or your turrets will fall really really fast.