I thought I'd share this as I haven't seen anyone else post it yet, and the changes are pretty significant.
It appears that photography is now allowed in Italian State Museums, many of which had previous bans. This would include the Uffizi, Borghese, Academia and others. See the list of state museums here:
As far as I've been able to see, flash and tripods are still banned (good thing).
There have also been changes to hours and ticketing - including no more free tickets to persons of any nationality over age 65, new free Sundays, late openings on Friday, etc. See this:
The Italian release regarding hours, free Sundays, etc:
Again, these new guidelines apply ONLY to the state museums and not to those which fall outside of the system such as those owned and operated by religious organizations.