Sonic 2017's Official Title is Sonic Forces, Sonic Mania Delayed to Summer

SEGA announced a pair of updates regarding the two Sonic the Hedgehog games the publisher has in development.
The first gameplay of modern Sonic in Sonic Forces is coming soon.

SONIC MANIA Will Cost $20 — GameTyrant

Sonic Mania delayed

Sonic Frontiers interview: 'Fans don't yet understand what this new gameplay is

After Being Delayed Into The Summer, Sonic Mania Has A

Sonic Mania Delayed To Summer - Fans Told It Takes Time

I hate when a new mediocre Sonic game comes out and Sonic fans bring old games everyone hated and treat it like the holy grail. NO, Sonic 06 was not a “misunderstood

Sonic Mania Delayed, Project Sonic 2017 Receives Official Name

Sega publishes first gameplay footage of Sonic Forces, delays retro-inspired Sonic Mania

Dr. Robotnik – Wizard Dojo

Sonic 2017 Review: Mania Does What Forces Don't // The Roundup

SONIC MANIA Delayed Until Summer 2017 — GameTyrant

My Nintendo in North America Adds New Sonic Rewards

Sonic Project 2017 Revealed as Sonic Forces — GAMINGTREND

Sonic Forces teased in brief new trailer