I would think that you have indeed had the PN US speed upgrade.
I had this on Wednesday morning and it has resulted in quite substantial changes to the line as well as the actual US speed change, think it may well have involved a full DLM reset.
I lost over 3 Mbps DS synch rate but actually very little DS data throughput rate as G.Inp appears to have been changed back to retx low profile.
My DS SNRM has also increased my 2 dB.
Can't currently check my BRAS profiles as the BT checker is not working, a known issue, see PN forums.
I'am on MDWS, ID tiffy if you care to look at the change over which occured @ 07:30 on 15/11/17.
I was also monitoring the BT checker site and the PN "my questions" area, nothing has appeared in either before or after the upgrade, apparently the PN e-mail notification of the changes will appear eventually but at least 2 days after the event according to other PN users experiences, I have not received mine yet.