Rock Band 4 January Update Delayed Until February
Harmonix has confirmed that their January update for Rock Band 4 has been delayed until the first week of February due to having to fix the "Overdrive Squeeze not-really-an-exploit-but-we're-fixing-it-anyway thing" which the company discovered in December.
Following this little hiccup, Harmonix has stated that they intend to released updates on a monthly basis; 'monthly' meaning "both 'coming every month' as well as 'coming roughly a month apart from each other'" for clarity.
Detailed patch notes will arrive on the day of the update but, for now, we know that the update will include "sweet Psychonauts gear", audio improvements, and more sometime between February 1st and February 5th.