While I am not expecting ANYTHING to come from this upcoming maintenance period, I would like to respond to the people who claim an update could never come so closely on the heels of a previous update. Here is some information on previous GT6 updates:
(Version, Release Date MM/DD/YYYY, Quick Summary of Update, Days Between Updates)
v1.01 12/5/2013 Brings Vision GT, Online Features, & More
v1.02 12/18/2013 Red Bull X Challenge, Login Credit Bonus & More
13 Days
v1.03 1/22/2014 BMW M4, the Toyota FT-1 concept, and Mario Andretti's 1948 Hudson stock car
v1.04 1/28/2014 Mercedes-Benz AMG Vision Gran Turismo Racing Series, the Corvette Stingray GT Concept '13 and two variants of the Gran Turismo Red Bull X2014
6 Days
v1.07 5/14/2014 Minor functionality tweaks to online mode, BMW Vision GT
v1.08 5/30/2014 Ayrton Senna Tribute Content, Mitsubishi Vision GT Car
16 Days
v1.10 7/25/2014 Aston Martin DP-100 Vision Gran Turismo and Nissan CONCEPT 2020 Vision Gran Turismo, Brake Caliper Paint, More Car Number Customization Options and Engine brake reduction control on formula cars disabled
v1.11 8/6/2014 Improvements to mutli-monitor and open lobby
12 Days
v1.15 12/17/2014 Chevrolet Chaparral 2X Vision Gran Tursimo & Infiniti Vision Vision Gran Tursimo
v1.16 12/24/2014 Mazda LM55 Vision Vision Gran Tursimo
7 Days
The website that I took this information from stopped at v1.16. There was also set of updates 15 days apart that I forgot to list. So, as you can see...there are occasionally times when updates do occur fairly close to each other.
SOURCE:
http://justinfromthesandbox.blogspot.com/2015/01/gran-turismo-6-update-history.html