The Weekly Operating Notice for this week (Saturday 12th Jan) has updated sectional appendix pages for Windsor Bridge South Jn to Burden Jn which have the enhance running (upto max 100mph).
As with north of Bolton to Chorley, this clearly hasn't been signed off so the 75mph speed restriction will be in place (also like Bolton - Chorley) .as nothing is in the WON Section A, it will initially be an Emergency Speed Restriction until it can be published as a Temporary Speed Restriction .
I'm not convinced it's to allow EMUs to run on Sunday, but happy to be proved wrong.
The WON late last year also had these speed increases detailed, but the work never went ahead.
As of yet there is no published ESR, but the SA pages are dated the 13th so the ESR wouldn't come into force until tomorrow anyway.