a) ProgDay XVII is still happening (not in doubt, but if I don't state that someone will ask). b) Tickets are on sale at this link.
ProgDay preshows and night of shows offsite at Local 506:
9/2 Progday Preshow w/ GALACTIC COWBOY ORCHESTRA / CAMERON ALLEN
9/3 Proday Saturday Night Show with GEORGE-PRESTON-HERRETT / LACTOSE QUERVO
I played a gig one night with Lactose Quervo a few years ago, they're nice people and play fun music.
From the ProgDay mail list, band #5:
The Rebel Wheel Rolls Into ProgDay with Special Guest Guy LeBlanc!
From Ottawa, Canada, THE REBEL WHEEL began in the early 1990s out of a shifting cooperative of musicians working in a myriad of styles producing both improvised and arranged music. Early work tended towards neo-prog, but over the years the band pursued a more aggressive and edgy direction that eventually evolved into the sound they have today. Steeped in dark, cinematic soundscapes and complex turn-on-a-dime arrangements, sometimes dissonant, sometimes mellow, always eclectic, their musical landscape has been compared to WETTON-era KING CRIMSON, ZAPPA, RUSH, PINK FLOYD, and at times even YES and GENESIS. But in the end their personality is all their own.
Recently working and gigging as a three-piece while ANGIE MACIVOR is on hiatus with the birth of her first child, THE REBEL WHEEL have expanded their lineup for ProgDay to include guest keyboardist-extraordinare GUY LeBLANC, acclaimed for his work with NATHAN MAHL and CAMEL. We're sure this special show will be a treat for fans of both THE REBEL WHEEL and Guy LeBlanc.
THE REBEL WHEEL joins U JSME DOMA (Czech Republic), PANZERBALLETT (Germany), QUANTUM FANTAY (Belgium) and FIBONACCI SEQUENCE (US) at this year's ProgDay, the longest running progressive rock festival in the world. ProgDay's 17th edition will take place on Saturday, September 3, and Sunday, September 4 at Storybook Farm in Chapel Hill, North Carolina. For more information, and to hear music from all of this year's bands, please visit us at http://www.progday.net.
Of the five , I'm personally looking forward the most so far to Panzerballett just because any band that namechecks John Zorn and Meshuggah already has my attention.
 Checking the ProgDay Bands page I see Mörglbl is also listed. So that's six bands announced. Spiffy.