Even though players moved via waivers after August 31 cannot take part in the playoffs, there will be at least one more "high-profile" player involved in a trade or acquisition.
Someone with money to spend and a need to fill will look to take advantage of a team with a losing record hoping to shed some salary. I have two proposed possibilities that you'll likely disagree with, but there are any number of them out there waiting to be visited.
The first proposal is Howie Kendrick to the Cubs. On L.A.'s side of reasoning, it needs to start cutting costs somewhere if it's going to re-sign Mike Trout and/or Mark Trumbo this offseason, and the $19.55 million owed to Kendrick over the next two seasons is a great place to start.
For the Cubs, Darwin Barney is a terrible long-term option at second base, and they don't have anything else in the pipeline, unless top prospect Javier Baez is going to switch positions. Kendrick would give them some veteran leadership to build a young team around. Factor in the Cubs' deep farm system and the Angels' complete lack of prospects, and it's a pretty logical move.
(Of course, this all depends on Kendrick coming back from the disabled list.)
Another move I could possibly see transpiring is John Danks to the Nationals. If the White Sox don't foot any portion of the bill, it would be a $47.25 million commitment by the Nationals over the next three seasons, but would fill the expensive void left by Dan Haren's assumed departure after the season.
Though they couldn't actually use him in the playoffs, Danks might be the fifth starting pitcher they need to make a playoff push over the final month of the season.