The latest Smallville scoopage from Kristin with E! Online:

James from Atlanta: Have you heard if we finally get Lois for all 22 episodes of Smallville season 10?
Details of Erica Durance’s contact for next season are still up in the air, but I have it on good authority that we will “probably” see Lois “more than usual” on Smallville next year.

Hamilton in Brentwood, Tenn.: Is this Chloe’s last season on Smallville?
All I can tell you is that there is no deal yet for Allison Mack to return to Smallville next year. That could change at any time, but nothing so far…

Ruth in Boise, Idaho: Is it true Gil Bellows is coming to Smallville? I loved him on Ally McBeal!
Yes, he is, and he is still evil (though not because of a brain tumor this time–sigh, remember those days?!). He’s playing Maxwell Lord for two episodes this season, per my sources. Hey, maybe he can go replace Rob Lowe on Brothers & Sisters and be Calista’s new squeeze?

SOURCE: E! Online