To my knowledge, Wicked is the only coaster that launches vertically, and it starts on horizontal track. Mr. Freeze has linear motors on the vertical section, but they don't really launch, just boost. Almost every other coaster either launches on level track or a slight uphill. A few have a decent slope to the launch, but it is nowhere near vertical. Rides may appear to have vertical launches, but in 99% of the cases they don't.
I highly doubt this new coaster will launch vertically, especially from a standstill. It would take a lot of power to launch a train vertically because the acceleration will not only have to get the train up to speed, but will also have to overcome the acceleration due to gravity (9.8 m/s or approximately 32 ft/sec). I'm guessing that BGW will end up with something similar to Cheetah Hunt if it is an Intamin, or a larger version of SWSD's Manta if it isn't.
Top 5 Steel: Bizarro (SFNE), Tatsu, Maverick, Top Thrill Dragster, Kingda Ka
Top 5 Wood: El Toro, Voyage, Boulder Dash, Thunderhead, Ravine Flyer II
Top 3 Parks: Busch Gardens Williamsburg, Holiday World, Cedar Point
TPR Trips: IntimidaTour 2010, North East Trip 2011, LeviaTHON 2012