I tooed my phone (LG V30+) this weekend and I noticed that the ##data# screen now shows "Enable All" instead of the weird letter salad which it showed previously. Not sure what this means exactly but at least now I can use NetworkSignalGuru. On that note, it confirmed what everyone else stated which was the B25 was 15x15. As for the other details, it appears to also be max 64QAMx64QAM and 2x2 MIMO which is pretty impressive because the numbers I was getting were near the theoretical limit for that combination (112.5/56.3 and I got 112/42.3).
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I found something interesting while looking through some AT&T site plans I found online, this is from a site in Connecticut. Looks like they have a SiriusXM repeater on the B30 antenna. I'm guessing this helps to eliminate the interference B30 causes to Sirius receivers. I wonder if they'll eventually do this in all of the markets they had to shrink B30 down to 5x5, or at least in the urban areas.