User blog comment:DarkCougar555/The Series Will be Ending/@comment-24055022-20160312171032/@comment-4411019-20160313134219

From this article's link:

"We are ending the show after an amazing 103 episodes with pride, love, and gratitude,” Weiss wrote.

Click this Season Five, and look at 103 and 510. So, as for crossover, it seems it is unlikely. But, maybe on The Foster series?