Starting the new snapshop server version generated a playable world just fine. It's just that there don't appear any messages/logs server-side neither on the regular GUI (tested on Win7) nor on Linux with -nogui. When started with -nogui I get various Error messages stating

ERROR StatusLogger Unrecognized format specifier [<n, msg, logger, level, thread, d>]
ERROR StatusLogger Unrecognized conversion specifier [<n, msg, logger, level, thread, d>] starting at position <56, 54, 47, 35, 25, 16>

(several error messages each with one format/conversion specifier pair.

I didn't get this error with any previous snapshots and even created a new folder just to be sure it didn't have anything to do with last week's 14w26a/b