General Information:
Release Date: August 2016
Price Point: $69
Retailer: Transformers Collector's Club Exclusive
Accessories: Missiles x 2, Swords x 2

Disclaimer: This action figure was provided to me at no charge by the Transformers Collector's Club for review purposes.

"Titans Return" continues into 2017 with new figures incoming for all size classes. This year also introduced Titan Class Trypticon into the mix. This listing was based on the one at the excellent TF Wiki page with some modifications.

General Information:
Release Date: August 2016
Price Point: $74.99 (depending on retailer)
Retailer: Online Shared Exclusive (Amazon, BigBadToyStore etc.)
Accessories:

General Information:
Release Date: June 15, 2016
Price Point: $59.99 (US Price)
Retailer: Entertainment Earth Exclusive (US), General release (Singapore), Toys R Us (Canada)
Accessories: Shield (Grimlock), Sword (Grimlock), Sword (Bumbleee)

Transformation to City Mode:

While it is true Fortress Maximus is a redeco and retool of Titan Class Metroplex, he doesn't just have a new head. There are a lot of new parts on this figure. Pretty much all that has carried over from Metroplex are parts of the hip/waist area (where Metroplex's back is now the front), the forearms/hands and parts of the legs. The rest of the figure features all new parts with designs based on the G1 Fortress Maximus' design. Here's a rundown of the new parts on the figure and their inspiration:

General Information:
Release Date: July 2016
Price Point: $179.99 (depending on retailer)
Retailer: General (Toys R Us, Target, Wal-Mart etc.)
Accessories: Dual barreled cannons x 2; Sword; Dual barreled emplacement, Cerebros figure, Emissary figure, Helipad

General Information:
Release Date: May 2016
Price Point: $16.99 (depending on retailer)
Retailer: Limited online release (Amazon, Bigbadtoystore etc.) & Toys R Us Taiwan Exclusive
Accessories: Hand/Foot/Weapon, Blasters x 2

General Information:
Release Date: October 2016
Price Point: $17.99-19.99 (depending on location)
Retailer: Walgreens Exclusive
Accessories: Teslor Titan Master figure, Shield, Blaster

General Information:
Release Date: December 2016
Price Point: $45.99 (depending on retailer)
Retailer: General (Toys R Us, Target, Wal-Mart etc.)
Accessories: Soundblaster Titan Master figure, Rifle, Mini-Vehicle

Official images and text below in italics are from Amazon.com: