According to Variety, Kara Royster has been cast as Yvonne, a woman that Toby meets during a robbery (umm, we'll definitely need further explanation on that meet-cute) and gets very close to. Though it's not clear if Yvonne will become Toby's one true bae, PLL showrunner I. Marlene King did tell the trade that Toby is "extremely involved" with Yvonne, and that she's one of the first people that Toby connected with after he and Spencer grew apart. The term "girlfriend" was never dropped, but, let's be real: it totally sounds like she's his main squeeze.
As for Spencer, it appears that she's flying solo this season now that she and Toby are officially dunzo. Conspiracy theorists might consider that her ex-mance with the Tobster leaves room for Wren to swoop back into her life, but I'm thinking that Spencer might be pretty content working on her career this time around. I'll certainly miss Spoby, but hopefully these two exes can share the turf in Rosewood on friendly terms.