Spiner did appear as an ancestor of Soong in the series of episodes that explained the "smooth forehead" Klingons. Basically it involved "augments" similar to Khan and Soong's ancestor at the end said something like maybe he should look into robotics (or something like that).
As for Geordi, the tie-in comics had him working at the Mars shipyard, but he obviously survived the synth attack because he was mentioned in the first season and now this thing. As for his current whereabouts, In the All Good Things future he got married to "Leah" (Possibly Leah Brahms, who must've split from her husband?)