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finally, as i'm seeing the words Exoddus and Retcon together in the same sentence: Soulstorm's a new game in a new series, it's not Exoddus but the start of a whole new story arc, as evidenced by Lorne's pyramid slides. 
go Abe! |
As far as the overall Oddworld universe lore goes, of course certain things get retconned. If we really want to get technical we could draw a line between the old games and the new games, but fact is that the rebooted series takes priority in terms of lore. The new Glukkons in charge are a good example. Those directly retcon Aslik, Brewmaster and Phleg. There's no way around that. And there's bound to be more situations where old and new lore will conflict heavily.
Point being, as writers and devs you shouldn't be afraid of retcons. Because when the writers of the lore start claiming that both sides of the lore are equally canon, things get really messy really fast.