No need for any negative speculation and unless you are on the Beta Test team you are not going to find out, however there are some clues for all to see.
First clue is a recent post made by a tester on instructions from N3V re warning about the tightening up on the validation of mesh libraries with immediate effect.
Second clue is the new DLS WIP leak...... found by a user on here.
Third clue is version 3.7 uploads being tested, we are only on 3.6
Fourth possible clue was the exciting news hinted at in a Newsletter a couple of weeks back, although that may have been something else?
New version of Trainz if it was imminent would have probably been announced by now, so that probably means the Soon ™ service pack.