As far as hints at the ballpark go, the Cardinals are more likely to reveal some of their decisions early by what they do on the field before a game than what they announce on Twitter.
When Paul Goldschmidt was hampered by a sore back and about to miss the home opener, an early indication was Matt Carpenter coming out earlier that day to take groundballs at first base and go through a progression of drills. On Sunday morning, with no BP on the field, a pair of outfielders came out to take fly balls and work on throws and cutoffs to second base.