Yep I don't trust Lotor at all. He's always being a villain just like his father. Guess we'll have to wait for season 6 to find out.
I also hope to see if Allura may actually create a Sixth Lion of Voltron to house the guardian spirit of the White Lion. She has both the knowledge and the resources (assuming that Lotor is still cooperating with her and doesn't hoard the comet) to do so, and it would be interesting to see how this would affect the dynamics of Voltron team and how this will affect the abilities of Voltron itself. There's also the possibility that Haggar herself may create her own variation of Voltron or at least enhance the quality and capacity of her Robeasts should she attain the secrets of Altean alchemy on Oriande.