Garmin said:

Thank you for contacting Garmin International,

I have checked with the software engineers for the 496 and 396 and there
has been no changes to the way those units receive or process the TIS
information. Also I noticed that one person was talking about
downgrading the software version in his 496. I strongly recommend
against doing that. Downgrading software can have negative effects to
the units. For example it will delete the unlock to the pre-installed
street maps.