Difference between old Unlimited Intro and new Unlimited plan

Choose the Unlimited data option that’s right for you: With the Unlimited
You can stream video in SD.
You'll receive a personal hotspot capable of 3G speeds.
After you use 30 GB of monthly data, your download and upload speeds will be reduced to 1.5 Mbps download/750 Kbps upload for the rest of your billing cycle.
Once the next billing cycle starts, you’re back to full speed.*
You won’t be charged extra for using over 30 GB of monthly data use.
You'll have premium data.
This means you have priority of service during times of network congestion, like at music festivals and sporting events.
With the Unlimited Plus
You can stream video in HD (720p).
The first 15 GB of your personal hotspot usage will be at the maximum speed available (based on your device’s capabilities and network capacity).
After your personal hotspot usage exceeds 15 GB, your hotspot speeds will be reduced to 3G speeds for the rest of your billing cycle.
After you use 50 GB of monthly data download and upload speeds are reduced to 5 Mbps download/2 Mbps upload for the rest of your billing cycle.
Once the next billing cycle starts, you’re back to full speed.*
You aren’t charged extra for the data you use.
You'll have premium data.
This means you have priority of service during times of network congestion, like at music festivals and sporting events.

I have a similar question. I don't want substandard priority for phone calls, which some previous xfinity plans had. Will I get same priority as I have now with my old by the gig plan if I move to new unlimited plans?