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.

Sega came up with a way to get fans excited about Sonic the Hedgehog again

Sonic The Hedgehog: 25 years of a video game icon Part 2 – Blueknight V2.0

Sonic Forces Review - Gamereactor

SONIC MANIA Delayed Until Summer 2017 — GameTyrant

Sonic Forces Info Drop

My Nintendo in North America Adds New Sonic Rewards

Sonic Mania – News, Reviews, Videos, and More

Sonic Mania' delayed, 'Project Sonic 2017' is called 'Sonic Forces

Sonic Mania Collector's Edition Review

SONIC MANIA Delayed Until Summer 2017 — GameTyrant

Sonic News: Mania Delayed, Project Named - News - Nintendo World Report

Sonic Mania Delayed; Project Sonic 2017 Gets A Name - GameSpot

After Being Delayed Into The Summer, Sonic Mania Has A

After Being Delayed Into The Summer, Sonic Mania Has A