7/16 UPDATE:
The Cubs have purchased the contract of minor league (and ex-Cubs) C-INF P. J. Higgins from the Arizona Diamondbacks, and he has been assigned to AAA Iowa.
As is typical for these types of transactions, the D'backs were probably paid an amount equivalent to the MLB waiver price ($50,000), even though Higgins was on a minor league reserve list.
7/15 UPDATE:
The Cubs have released RHRP Rowan Wick.
Wick had been sent outright to the minors in March, and as Article XX-D player, he had the right to elect free-agency immediately (in which case his contract would have been immediately terminated and he would have received no termination pay), or accept the outright assignment and defer free-agency until the after the conclusion of the MLB regular season (presuming he had not been added back to MLB 40-man roster in the meantime).