.....
Both DC and OS look promising - I'd probably buy both but as someone mentioned above a lot of the Divinity 2 fans will go for Dragon Commander where fans of the original Divinity will go for Original Sin.
Maybe yes, maybe no ... I'm a DKS fan AND I'm a fan of DD ! So ehmmmmmm ... which of the two upcoming games would I start with ?

Hope they come not at the same time on the market ... it can

me a lot

... I really love games like DKS (3 dimentional), but since DC isn't a real RPG I prefer D:Original Sin still above Dragon Commander .
I'm betting that Larian's project after DC and OS will be Divinity 3 and it will be a 3rd person interface - the game only known as the 'RPG to dwarf them all'.
Hmm ... I was thinking

Original Sin will be the game to dwarf them all ! No ?