Methinks, from what Craig posted on twitter, it will be the Spearman whom we'll be able to recruit- after all, there are no noticeable Spriggats in Ravinale, they're more likely to be recruited somewhere out there in Somnus. If Gelf is added as per the side-quest, he'll also be recruited outside Ravinale. What with the new dialogue and all, I think we're in for a spearman teammate.
Naturally, I'd love to see Gelf as the 10th teammate, and I wouldn't mind at all seeing a Shadowling Healer as the 11th, especially as healers are the main target with the new enemy AI.