I almost wonder if they mean that that's when they'll start delivering things such as the monthly newsletter. If it is, that would suggest that by that time, they'll have shifted their development solely to Cognition, which to me, strongly implies that TSL will be done by then.
I wasn't sure how long it was going to take to do episode 5, since they're switching to a new engine and everything, but this would seem to imply by June.
Alternatively, it was a default date set by Kickstarter and means nothing for their development.

Either way, I really doubt that this is when the first episode of Cognition will be released, unless they've been putting a LOT of resources into it already.