Among the other projects Mike Portnoy has done/is doing since leaving Dream Theater in 2010:
(The Winery Dogs, The Neal Morse Band, Flying Colors, Metal Allegiance, Transatlantic, Shattered Fortress, PSMS, ex-Adrenaline Mob, ex-Avenged Sevenfold).
This new band/project adds to his resume. And as it reads below, it will be the 1st progressive metal style music he's done since leaving Dream Theater beyond Shattered Fortress really.
Besides Mike, Keyboardist Derek Sherinian who of course was a member of Dream Theater during the release of A Change of Seasons and Falling Into Infinity. And then went on to be part of Platypus and form hyis own band Planet X. Recently worked with Portnoy in PSMS.
The rest of the band?
This topic on the dreamtheaterforums goes over potentially some of it.
Bumblefoot
Members of Haken?
Eric Gillette?
And then a singer sounds like is part of this. Who?
Some mention of John Arch, although the fact he doesn't typically tour, might end that being the case. Jeff Scott Soto? Who has a prolific career including Journey and working with Derek at 1 point.
The John Arch thing would be a huge thing for me and this project, although he wouldn't be writing music with Jim Matheos presumably, which couldn't be ignored.
Thomas Giles/Rogers from Between the Buried and Me?
1 suggestion for the bassist, if it's not Billy Sheehan whose been working with Portnoy a fair amount lately, was Jason Newsted. Although he doesn't have a prog background really, but that may not matter (neither did Derek when he joined Dream Theater).
I guess when more information comes, I'll either bump this or post a new entry about this new prog metal band of Mike Portnoy's.
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I have a new band I'll be announcing in the summer. It is premature to give away too much information about that now but I can say that it also involves Derek Sherinian who I worked with in Dream Theater. It is the two of us with an all-star line-up. It is myself and Derek getting back together and picking up where we left off. It's music that is probably closest to Dream Theater out of everything that I have done over the last six years. I have purposefully stayed away from the prog-metal genre because I wanted to spread my wings. But I would say that doing these Shattered Fortress shows has kind of reignited a little interest in revisiting that world from me. Derek and I have formed this new band that will satisfy myself and quench the fans' thirst for something in that vein.